Investment plans for storm discharge sites
During the final two years of this investment period, we're spending £1.12 billion in our sewage treatment works (STW). This includes £650 million to improve resilience and provide extra capacity at many of our sites. Over the same period, we’ll spend £470 million on the wider sewer network.
This has been our largest ever upgrade of sewers and STWs, with plans to improve more than 250 of our sites.
Our ambitious draft plans for our next investment period (2025 – 2030) include £885 million for reducing storm overflows. This is part of a £6.6 billion programme to improve the environment.
You’ll also find details of when we expect to meet the government's new targets for storm discharges. To meet these targets, we’re planning for a £13.4 billion investment over the next 25 years. You’ll find more specific detail on our storm overflow reduction plan on our investing in river health page.
Please note that this list, and details within it, will change as projects progress. This page was last updated on 29 October 2024.
A
Abbess Roding
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Abbey Mills
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Abbeydale Road
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Abingdon
An upgrade is planned for Abingdon STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2027.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Acton Storm Relief CSO
This combined sewer overflow (CSO) is now connected to the London Tideway Tunnels system. This is intercepting flows that would have previously discharged to the river. The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames. The work has already produced a positive effect on the river.
Find out how we're investing in river health.
Aldermaston STW
An upgrade is planned for Aldermaston STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in early 2026.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Aldershot STW
An upgrade is planned for Aldershot STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in early 2027.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Alicia Avenue CSO
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Allendale Road / District Road / Sudbury Heights Avenue
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Alperton Lane
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Alton STW
An upgrade is planned for Alton STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2026. We're also upgrading the storm tanks at the local Newmans Lane Pumping Station at a cost of over £5 million, which will reduce the need for untreated sewage discharges during storm conditions. The scheme is due for completion in 2025.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Alton.
Amersham Balancing Tanks/Amersham Vale STK
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Ampney St Peter STW
An upgrade is being planned for Ampney St Peter. It will include a substantial increase in treatment capacity, though the design hasn't been finalised. The project is likely to complete in 2027.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Ampney St Peter.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Anyand Park Road, Twickenham
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Andoversford
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Appleton STW
Appleton STW is being upgraded at a cost of more than £5 million. This work will provide a major increase in treatment capacity, from 34 to 47.5 litres per second. This will reduce the need for untreated discharges in wet weather. This work is currently expected to complete in 2024.
We have additional work planned in 2027, which will improve the ability to treat the volumes of incoming sewage.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Arborfield STW
An upgrade is planned for Arborfield STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2028.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Arford
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Ascot STW
Ascot STW is being upgraded at a cost of more than £11 million. This work will provide a major increase in treatment capacity, from 157 to 220 litres per second. This will reduce the need for untreated discharges in wet weather. It's due to complete in 2024. Additional work is planned and will be complete in 2026.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Ash Vale
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Aston Le Walls STW
Aston Le Walls STW has been upgraded to increase the capacity of the storm tanks at a cost of more than £0.5 million. This will reduce the need for untreated sewage discharges during storm conditions.
We're also planning to improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Auckland Road storm tanks
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Avon Dassett
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Avondale Road
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Aylesbury STW
Aylesbury STW is being upgraded at a cost of more than £15 million. This work will improve the treatment of sludge on the site.
We're also planning to improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2028.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
B
Bakers Farm, High Wych
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Bampton STW
An upgrade is planned for Bampton STW. This work will provide a major increase in treatment capacity, from 23 to 36 litres per second. This will reduce the need for untreated discharges in wet weather. We plan to complete this work in 2026.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Banbury Rd Middleton Cheney
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Banbury STW
Upgrades are planned for Banbury STW. They'll include an increase in treatment capacity, from 266 to 490 litres per second. This will reduce the need for untreated discharges in wet weather, and provide a higher quality of treated effluent going to the river. The treatment capacity upgrades are forecast to complete in 2026 and the effluent quality upgrades are forecast to complete in 2025.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Barbers Lane
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Barford St Michael STW
An upgrade is planned for Barford St Michael STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
Barkway STW
An upgrade is planned for Barkway STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2025.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Basingstoke STW
An upgrade is planned for Basingstoke STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2027.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Basingstoke.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Beckley
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
Beckton STW
Beckton STW is being upgraded at a cost of £185 million. This will increase the site’s capacity for population growth by extending the existing treatment processes.
Beckton STW will receive storm water from the Thames Tideway Tunnel and the project will improve resilience of the works to treat this flow. The project also includes elements of major plant maintenance to ensure resilience and effluent quality is maintained. The majority of the scheme is due for completion in 2024. Some elements of the project will extend to 2030.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Beddington
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Beech Hall Crescent, Walthamstow
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Beenham STW
An upgrade is planned for Beenham STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2024.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Beer Lane
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Bell Wharf
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Benson STW
Benson STW has been upgraded at a cost of more than £9 million. This work provides a major increase in treatment capacity, from 58.7 to 74.9 litres per second. This will reduce the need for untreated discharges in wet weather. The work was completed in 2024.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Benson.
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
Bentley STW
Bentley STW is being upgraded at a cost of more than £6 million. This project will increase the capacity of the storm tanks, so reduce the need for untreated sewage discharges during storm conditions. We will also be improving the quality of treated effluent going to the river.
The storm tank scheme is due for completion in 2024. We plan to complete the phosphorus scheme in 2025.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Bentley.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Berkhamsted STW
Berkhamsted STW is being upgraded at a cost of more than £25 million. The upgrades comprise two schemes; the first completed in 2023 and provides a major increase in treatment capacity, from 247 to 316 litres per second. This reduces the need for untreated discharges in wet weather. The second scheme will upgrade our treatment processes to ensure higher quality of treated effluent going to the river. We expect to complete this scheme in 2025.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Berkhamsted.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Bicester STW
Bicester STW has been upgraded at a cost of more than £8 million. This work provided increased treatment capacity, reducing the need for untreated discharges in wet weather. This work was completed in 2022.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Bicester.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Birchanger - Duck End
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Bishop Stortford STW
An upgrade is planned for Bishop Stortford STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2027.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Blackbirds STW
An upgrade is planned for Blackbirds STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2029.
Blacknest, Sunningdale
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Bledington
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Bletchingdon STW
An upgrade is planned for Bletchingdon STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
Blind Mans Gate, Highclere
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Bloxham STW
Bloxham STW was upgraded at a cost of more than £6 million. This provided a major increase in treatment capacity, from 30.6 to 38 litres per second, reducing the need for untreated discharges in wet weather. This work completed in 2023.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Blunsdon STW
An upgrade is planned for Blunsdon STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Boddington STW
An upgrade is planned for Boddington STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in early 2026.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Bookham SPS
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Bordon STW
An upgrade is planned for Bordon STW. This will improve its ability to treat the volumes of incoming sewage as well as providing a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Bourton on the Water STW
An upgrade is planned for Bourton on the Water STW. This work will provide a major increase in treatment capacity, from 47 to 143 litres per second. This will reduce the need for untreated discharges in wet weather. We expect the project to complete in 2025.
Work is also currently being carried out to reduce groundwater infiltration and other unwanted surface water entering the wastewater network in this area. This is due to complete by the end of 2025. Further investigation will continue in this area, which will help inform our long-term planning.
See our groundwater impacted system system plan for Bourton on the Water.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Box Hill
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Boxford STW
An upgrade is planned for Boxford STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
Boyne Avenue, Hendon
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Bracknell STW
An upgrade is planned for Bracknell STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Bramley
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Braughing STW
An upgrade is planned for Braughing STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
Brent Cross Flyover
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Brent Valley Golf Course, LB Ealing
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Brentfield Gardens
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Brickendon STW
An upgrade is planned for Brickendon STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. We expect the project to complete in late 2025.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Bridle Close, Ewell
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Brixton Storm Relief Sewer
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Broadwell STW
An upgrade is planned for Broadwell STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. We expect the project, which is still being designed, to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Brockham Bridge
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Brook Way, Chigwell
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Broome (Attenuation Tank)
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Bucklebury (Briff Lane)
An upgrade is planned for Bucklebury STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. We expect the project, which is still being designed, to complete in summer 2025.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Briff Lane Bucklebury.
Bucknell
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Buntingford STW
Buntingford STW is being upgraded at a cost of more than £12 million. This work will provide a major increase in treatment capacity, from 40 to 48 litres per second. This ensures a higher quality of treated effluent going to the river. This scheme will reduce the need for untreated discharges in wet weather. We expect the project to complete in 2024.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Burford
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Burghfield STW
An upgrade is planned for Burghfield STW. This will include an increase in treatment capacity, as well as a higher quality of treated effluent going to the river. This scheme will reduce the need for untreated discharges.
We expect the £17m project to complete in 2027.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Burghfield.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Burstow STW
Burstow STW is being upgraded at a cost of more than £23 million. This will improve its ability to treat the volumes of incoming sewage and provide a higher quality of treated effluent going to the river. We expect the project to complete in 2025.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Bushey Court, Raynes Park / Worple Road, SW19
We expect these locations to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Bute Street
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Byfield
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
C
Caddington STW
An upgrade is planned for Caddington STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2024.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Cage End, Essex
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Camberley STW
An upgrade is planned for Camberley STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Canfield End, Little Canfield
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Canfold Wood
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Canterbury Road, Thornton Heath
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Capel
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Carlton Cres Jnc Blenheim Cres
We expect this location to meet all government targets for storm overflows by 2030 – 2035. Find out how we're investing in river health.
Carterton STW
An upgrade is planned for Carterton STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in summer 2025.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Carterton.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Cascade Road Storm Tanks, Buckhurst
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
Cassington STW
An upgrade is planned for Cassington STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in summer 2025.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Castle Drive
We expect this location to meet all government targets for storm overflows by 2045 – 2050. Find out how we're investing in river health.
Castle Gardens, Dorking
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Chacombe
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Chadlington
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Chalgrove STW
Chalgrove STW is being upgraded at a cost of more than £1 million. This project will increase the capacity of the storm tanks, reducing the need for untreated sewage discharges during storm conditions. The scheme will complete in 2024.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Channelsea West Ham Lane PS
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Chapel Row (Berks)
An upgrade is planned for Chapel Row STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in early 2026.
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
Chapmore End STW
Chapmore End STW is being upgraded at a cost of over £3 million. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2023.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Charlbury STW
An upgrade is planned for Charlbury STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in early 2025.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Charlton Storm Relief
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Charlton-On-Otmoor
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Charlwood, Surrey
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Chelsea, London SW10
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Chertsey STW
Chertsey STW is being upgraded at a cost of more than £15 million. This project will increase the capacity of the storm tanks and improve its ability to treat the volumes of incoming sewage. This will reduce the need for untreated sewage discharges during storm conditions. The storm tank scheme is due for completion in 2024, with other works completing in 2027.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Chesham STW
Chesham STW is being upgraded at a cost of more than £20 million. These projects will provide a major increase in treatment capacity to 353 litres per second. This will reduce the need for untreated discharges in wet weather and ensure a higher quality of treated effluent going to the river. The treatment capacity upgrade completed in early 2023 and we expect the effluent quality upgrade to complete in early 2025.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Chesham.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Chieveley STW
An upgrade is planned for Chieveley STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Chigwell Road / Langston Road
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Chigwell Road / Woodford Green
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
Chingford Storm Tanks
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Chinnor STW
Chinnor STW is being upgraded at a cost of more than £10 million. This project will provide a major increase in treatment capacity, from 47 to 73.8 litres per second This will reduce the need for untreated discharges in wet weather. We expect the project to complete in 2025.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Chinnor.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Chipping Norton STW
Chipping Norton STW is being upgraded at a cost of more than £5 million.This will improve its ability to treat the volumes of incoming sewage reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2027.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Chipping Warden STW
We've completed an upgrade at Chipping Warden STW. This provides more reliable and accurate information relating to untreated discharges. The scheme completed in 2024.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Chisledon Storm Tanks
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Chobham STW
Chobham STW is being upgraded at a cost of more than £12 million. This project will ensure a higher quality of treated effluent going to the river, and improve its ability to treat the volumes of incoming sewage. We expect the project to complete in 2025.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Cholsey STW
Cholsey STW is being upgraded at a cost of more than £5 million. It includes an increase in treatment capacity from 74 to 105 litres per second and an increase in storm tank capacity. This will reduce the need for untreated discharges in wet and stormy weather. We expect the scheme to complete in 2024.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Church Hanborough STW
An upgrade is planned for Church Hanborough STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Church Hill Road, Barnet
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Church Road / Somerset Road, Wimbledon
We expect Church Road to meet all government targets for storm overflows by 2030 - 2035. We expect Somerset Road to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Church Road/Brent Lodge Park (Bunny Park)
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Church Street KT13 8DP
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Church Street Sewer
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Churt
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Cirencester STW
Cirencester STW is being upgraded at a cost of more than £22 million. This project will provide a major increase in treatment capacity, from 269 to 484 litres per second. It will also include an increase in storm water volume and treatment capacity via land treatment. This will reduce the need for untreated discharges in wet weather. We expect the project to be complete in 2025.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Cirencester.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Clanfield STW
An upgrade is planned for Clanfield STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2027.
Work is also currently being carried out to reduce groundwater infiltration and other unwanted surface water entering the wastewater network in this area. This is due to complete by end of 2025. Further investigation will continue in this area, which will help inform our long-term planning.
See our groundwater impacted system management plan for Clanfield.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Clapham Storm Relief Sewer, London
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Clavering STW
An upgrade is planned for Clavering STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2028.
Clifton
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Cobham Bridge, Adj Cobham PS
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
15 Coldharbour Lane, Bushey
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Coldicote
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Colgate
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Colin Crescent, Colindale
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Combe
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Commonside
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Compton STW
An upgrade is planned for Compton STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2025.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Compton.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Conolly Road Hanwell
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Coppice Green, Bracknell
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Cottered STW
Cottered STW has been upgraded at a cost of more than £2 million. This project has increased the capacity of the storm tanks. This will reduce the need for untreated sewage discharges during storm conditions. The scheme was completed in 2023.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Counters Creek, Lots Road
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Cranleigh STW
An upgrade is planned for Cranleigh STW. This will improve its ability to treat the volumes of incoming sewage as well as providing a higher quality of treated effluent going to the river. We plan to complete this work in 2027.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Cranleigh.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Crawley STW
Crawley STW is being upgraded at a cost of more than £34 million. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2024.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Cricklade STW
Cricklade STW is being upgraded at a cost of more than £5 million. This project will provide a major increase in treatment capacity, from 26 to 30 litres per second, reducing the need for untreated discharges in wet weather as well as including an increase in storm tank capacity. We expect the project to complete in 2025.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Cricklewood Broadway
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Cricklewood Lane, Cricklewood (A41 Hendon Way)
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Crofton Road, Sunnydale
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Crondall STW
We've completed an upgrade at Crondall STW. This improves its ability to treat the volumes of incoming sewage. The scheme completed in 2024.
We also identified the opportunity to optimise the existing assets to improve effluent quality. We agreed the new permit in 2024.
See our groundwater impacted system management plan for Crondall.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Crooked Billet
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Cropredy STW
An upgrade is planned for Cropredy STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Crossness STW
There’s a range of complex schemes underway at Crossness STW, including work to improve its ability to treat the volumes of incoming sewage. These schemes are likely to continue until 2030.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Croughton STW
An upgrade is planned for Croughton STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2025.
Cuddington STW
An upgrade is planned for Cuddington STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete before the end of 2025.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Culham STW
An upgrade is planned for Culham STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2027.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Culworth STW
An upgrade is planned for Culworth STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in early 2027.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
D
Dagnall STW
An upgrade is planned for Dagnall STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2025.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Daintry Close
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Dallow Road Jnc Lyndhurst Road
We expect these locations to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Darkes Lane, Potters Bar
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Dartford Creek Storm
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Dartnell Park, Byfleet
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Deadmans Bridge
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Dean Oak Lane
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Deephams STW
There’s a range of complex schemes being planned at Deephams STW, including work to improve its ability to treat the volumes of incoming sewage. These schemes are likely to continue until 2030.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Deptford Creek Storm
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Deptford Storm Relief
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Didcot STW
An upgrade is planned for Didcot STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2028.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Dorchester STW
Dorchester STW has been upgraded at a cost of more than £2 million. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme completed in 2023.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Dorking STW
Dorking STW is being upgraded at a cost of more than £14 million. This project will increase the capacity of the storm tanks and improve its ability to treat the volumes of incoming sewage. This will reduce the need for untreated sewage discharges during storm conditions. The storm tank scheme is due for completion in 2025, with further works to improve the sites ability to treat incoming flows completing in 2027.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Dorking Road
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Dorton STW
An upgrade is planned for Dorton STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Draycot Foliat
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Drayton STW
An upgrade is planned for Drayton STW. This project will provide a major increase in treatment capacity, from 43.3 to 57 litres per second. An increase in storm tank capacity will reduce the need for untreated discharges in wet weather. We expect the project to complete in 2025.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Dunstable Road – Beech Road / Francis Street
We expect these locations to meet all government targets for storm overflows by 2030 - 2035.
George Street – King Street / Wellington Street
We expect these locations to meet all government targets for storm overflows by 2030 - 2035.
Kingsway (near railway bridge)
We expect this location to meet all government targets for storm overflows by 2030 - 2035.
Park Street - Bailey Street / opposite Parmead (lower level weir)
We expect these locations to meet all government targets for storm overflows by 2040 - 2045.
Duntshill Road
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
E
Earl
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Earlswood (Reigate)
Upgrades are planned for Earlswood STW. These will include an increase in treatment capacity, from 340 to 400 litres per second, providing a higher quality of treated effluent going to the river. This scheme will reduce the need for untreated discharges in wet weather. We expect the projects to complete in 2026.
Earlswood Common, S Of Pendleton Road
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
East Garston
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
East Grafton STW
East Grafton STW has been upgraded at a cost of more than £0.4 million. This scheme increased the capacity of the storm tanks. This reduces the need for untreated sewage discharges during storm conditions. The scheme completed in 2023.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
East Lane CSO 1
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
East Shefford STW
East Shefford STW is being upgraded at a cost of more than £10 million. This project will improve its ability to treat the volumes of incoming sewage, providing a higher quality of treated effluent going to the river. We expect the project to complete in 2024.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for East Shefford.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Eastcote Avenue
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Easthampstead Park STW
An upgrade is planned for Easthampstead Park STW. This will improve its ability to treat the volumes of incoming sewage as well as providing a higher quality of treated effluent going to the river. We plan to complete this work in 2027.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Edgware Road
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Elmcroft Avenue, Wanstead
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Elms Road CSO
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Elstead STW
An upgrade is planned for Elstead STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2025.
Elvetham Close
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Empress Avenue
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Epping STW
An upgrade is planned for Epping STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2027.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Epsom Storm Tanks, Longmead Road
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Esher STW
An upgrade is planned for Esher STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2027.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Essendon, Holywell Bridge
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Ewhurst Road, Cranleigh, Surrey
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Eydon STW
An upgrade is planned for Eydon STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
F
Fairfield Avenue 1
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Fairford STW
An upgrade is planned for Fairford STW. This project will provide a major increase in treatment capacity, from 37.8 to 56.8 litres per second, reducing the need for untreated discharges in wet weather. We plan to complete this work in 2026.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Fairford.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Falcon Brook
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Falloden Court & Brookland Rise
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Faringdon STW
Faringdon STW is being upgraded to increase the capacity of the storm tanks and provide a higher quality of treated effluent going to the river. This will reduce the need for untreated sewage discharges during storm conditions. We plan to complete this work in 2026.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Faringdon House CSO
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Farnborough STW
An upgrade is planned for Farnborough STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Farnham STW
An upgrade is planned for Farnham STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
Fergusson Road, Banbury
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Field End Road Storm (Harrow)
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Field End Road (East)
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Finstock STW
Finstock STW is being upgraded at a cost of over £1 million. We completed upgrades in 2023 to ensure a higher quality of treated effluent going to the river. Further upgrades are ongoing to increase the capacity of the storm tanks. This will reduce the need for untreated sewage discharges during storm conditions. The scheme is due for completion in 2025.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Fleet Main Line Sewer
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Fleet STW
An upgrade is planned for Fleet STW. This will include an increase in treatment capacity, as well as a higher quality of treated effluent going to the river. This scheme will reduce the need for untreated discharges in wet weather. We plan to complete this work in 2027.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Folkestone Rd Tanks, East Ham
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Forest Hill STW
An upgrade is planned for Forest Hill STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Francis Road Spill
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Friday Street, Henley
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Frogmore Storm Relief (Bell Lane Creek) CSO
This combined sewer overflow (CSO) is now connected to the London Tideway Tunnels system. This is intercepting flows that would have previously discharged to the river. The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames. The work has already produced a positive effect on the river.
Find out how we're investing in river health.
Frogmore Storm Relief (River Wandle) CSO
This combined sewer overflow (CSO) is now connected to the London Tideway Tunnels system. This is intercepting flows that would have previously discharged to the river. The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames. The work has already produced a positive effect on the river.
Find out how we're investing in river health.
Fulmer Drive CSO (Howards Wood Drive)
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Fyfield STW
Fyfield has been upgraded at a cost of £2 million. This includes an increase in treatment capacity, providing a higher quality of treated effluent going to the river. This scheme will reduce the need for untreated discharges in wet weather. The project completed in 2023.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Fyfield.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
G
Gap Road (Cemetery)
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Garden Way
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Gascoigne Rd Storm Tanks, Beckton
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Gerrards Cross STW
An upgrade is planned for Gerrards Cross STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2027.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Godalming STW
An upgrade is planned for Godalming STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2028.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Gordon Road
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Gordon Road
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Goring
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Goswell Street
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Granville Road
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Great Bedwyn
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Greatworth STW
An upgrade is planned for Greatworth STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete by 2026.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Greenwich
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Grendon Underwood STW
An upgrade is planned for Grendon Underwood STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in mid 2025.
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
Guildford STW
We’re constructing a new sewage treatment works for Guildford at a cost of over £160 million. The scheme is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Gun Wharf (Wapping Dock)
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
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Haddenham STW
An upgrade is planned for Haddenham STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete before the end of 2024.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Hadham Mill
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Hambleden
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Hammersmith
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Hampstead Norreys STW
An upgrade is planned for Hampstead Norreys STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2025.
Work is also currently being carried out to reduce groundwater infiltration and other unwanted surface water entering the wastewater network in this area. This is due to complete by end of 2025. Further investigation will continue in this area, which will help inform our long-term planning.
See our groundwater impacted system management plan for Hampstead Norreys.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Hamstead Marshall
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Hanger Lane
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Hannington
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Hanwell STW
Hanwell STW is being upgraded at a cost of over £1 million. The project will increase the capacity of the storm tanks. This will reduce the need for untreated sewage discharges during storm conditions. The scheme is due for completion in late 2024.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Harpenden STW
An upgrade is planned for Harpenden STW. This will improve its ability to treat the volumes of incoming sewage as well as providing a higher quality of treated effluent going to the river. We plan to complete this work in 2028.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Hartley Wintney STW
An upgrade is planned for Hartley Wintney STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Haslemere
An upgrade is planned for Haslemere. This will improve its ability to treat the volumes of incoming sewage as well as providing a higher quality of treated effluent going to the river. We plan to complete this work in 2027.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Haslemere STW CSO
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Hatfield Heath STW
An upgrade is planned for Hatfield Heath STW. This will improve its ability to treat the volumes of incoming sewage as well as providing a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Hattchets Cricklade
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Heath Wall Pumping Station
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Henley Road
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Henley STW
An upgrade is planned for Henley STW. This will provide a major increase in treatment capacity, from 67 to 82 litres per second. This will reduce the need for untreated discharges in wet weather. We expect the project to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Heyford STW
An upgrade is planned for Heyford STW. This will provide a major increase in treatment capacity, from 17 to 22 litres per second. This will reduce the need for untreated discharges in wet weather. We expect the project to complete in 2025.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
High Road Loughton
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
High Road, Woodford
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
High Wycombe
We expect this location to meet all government targets for storm overflows by 2030 – 2035. Find out how we're investing in river health.
Highfield Road Jct With Brookside Road
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Highworth STW
An upgrade is planned for Highworth STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Highworth Eastrop
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Hillside Avenue / Kings Avenue / Princes Avenue / Worcester Crescent
We expect Hillside Avenue, Kings Avenue and Princes Avenue to meet all government targets for storm overflows by 2030 - 2035. We expect Worcester Crescent to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Hockford STW
An upgrade is planned for Hockford STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2029.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Hogsmill STW
Hogsmill STW is being upgraded to increase the capacity of the storm tanks. This will reduce the need for untreated sewage discharges during storm conditions. The scheme is due for completion in 2027.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Holloway Storm Sewer
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Holmwood STW
An upgrade is planned for Holmwood STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2028.
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
Holybourne
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Home Park Road
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Honeypot Lane
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Hook Norton STW
Hook Norton STW is being upgraded at a cost of over £11 million. This project will ensure a higher quality of treated effluent going to the river. We will also increase the capacity of the storm tanks. This will reduce the need for untreated sewage discharges during storm conditions. The scheme is due for completion in 2025.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Horley (Oxon) STW
Horley (Oxon) STW has been upgraded. This improves its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme completed in 2024.
Find out how we're investing in river health.
We expect this location to meet all government targets for storm overflows by 2040 - 2045.Horley (Surrey) STW
An upgrade is planned for Horley (Surrey) STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2027.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Hornton
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Horseferry Road
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Horton-Cum-Studley STW
An upgrade is planned for Horton-Cum-Studley STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2027.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Huckers Lane (Selbourne)
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Hull Green (Matching)
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Hungerford STW
Hungerford STW has been upgraded at a cost of over £5 million. This project has improved its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme completed in 2023.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Hurstwood Road West
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
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Iron Gate
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Ironsbottom (Sidlow)
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Isle of Dogs, London
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Islip STW
Islip STW has been upgraded at a cost of over £0.3 million. This scheme increased the capacity of the storm tanks. This reduces the need for untreated sewage discharges during storm conditions. The scheme was completed in 2023.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Iver (North)
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
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Jews Row Pumping Station (Falconbrook Storm Relief)
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Jnc Frederick Street & William Street
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Joyce Green West Syphon
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
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Kempsford
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Kendal Road, Cullingworth Road
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Kew Transfer
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Kilda Road
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Kimpton STW
An upgrade is planned for Kimpton STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2025.
We expect this location to meet all government targets for storm overflows by 2030 – 2035. Find out how we're investing in river health.
Kingham
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Kings Scholars Pond
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Kings Sutton
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Kingsclere STW
An upgrade is planned for Kingsclere STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2026.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Kingsclere.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Kingston Bagpuize STW
Kingston Bagpuize STW is being upgraded at a cost of over £31 million. This project will increase the capacity of the storm tanks, reducing the need for untreated sewage discharges during storm conditions. We’ll be ensuring a higher quality of treated effluent going to the river. The schemes will be completing in 2027.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Kingston Main
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Kingthorpe Terrace
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Kintbury STW
Kintbury STW has been upgraded at a cost of over £2 million. This project will improve its ability to treat the volumes of incoming sewage. This will reduce the need for untreated discharges in wet weather. The scheme completed in 2023.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Knights Lane
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Knightsbridge Road, Camberley
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Knowle Lane, Cranleigh
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
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Leaden Roding
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Leatherhead STW
An upgrade is planned for Leatherhead STW. This will provide a major increase in treatment capacity, from 250 to 320 litres per second. This will reduce the need for untreated discharges in wet weather. We expect the project to complete in 2027.
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
Lechlade
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Outside 135 Leeside Crescent
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Leopold Road, Church Path / Longstone Ave, Drayton Road
We expect Leopold Road, Church Path to meet all government targets for storm overflows by 2030 - 2035. We expect Longstone Ave, Drayton Road to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Leverson Street
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Lewknor STW
An upgrade is planned for Lewknor STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
Lightwater STW
An upgrade is planned for Lightwater STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2027.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Lincoln Road CSO
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Lindsay Drive, Falcon Way
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Little Compton STW
The scheme to increase the capacity of storm tanks, reducing the need for untreated sewage discharges during storm conditions, completed in 2023. A separate scheme due to complete in 2026 will also improve its ability to treat the volumes of incoming sewage.
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
Little Hallingbury STW
Upgrades are planned for Little Hallingbury STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2026.
Another scheme will also ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2029.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Little Marlow STW
An upgrade is planned for Little Marlow STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is likely to complete in 2028.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Little Marlow.
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Little Milton
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
Littlemead, Ind Estate, Cranleigh
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Littlemore Low Level
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
London Bridge
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
London Road near Hatherop Lane
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
London Road, Marlborough
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Long Reach STW
An upgrade is planned for Long Reach STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2027.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Long Crendon
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Longbridge Road
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Longley Road (1), Tooting High Street
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Low Hall Farm Storm Tanks, Walthamstow
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Low Level 1 N, Grosvenor Ditch, Millb
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Lower Cherwell Street, Banbury
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Ludgershall STW
An upgrade is planned for Ludgershall STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2027.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Luton (East Hyde) STW
An upgrade is planned for Luton (East Hyde) STW. This scheme will ensure a higher quality of treated effluent going to the river and improve its ability to treat the volumes of incoming sewage. We plan to complete this work in 2030.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Bancroft Rugby Ground, Buckhurst Hill
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Lyon Park Avenue
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Lytton Road SSO
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
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Maidenhead STW
An upgrade is planned for Maidenhead STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2026.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Maidenhead.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Main Road, Sidcup
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Manor Drive Stormwater Tanks
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Manor Farm
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Manuden STW
An upgrade is planned for Manuden STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2027.
Maple Lodge STW
Maple Lodge STW is being upgraded to ensure a higher quality of treated effluent going to the river, and to increase the capacity of the storm tanks. This will reduce the need for untreated sewage discharges during storm conditions. We plan to complete this work in 2030.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Maple Lodge.
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Mapleton Road
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Markenfield Road, Guildford
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Markyate STW
An upgrade is planned for Markyate STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2026.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Markyate.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Marlborough STW
An upgrade is planned for Marlborough STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2026.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Marlborough.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Marsh Gibbon STW
An upgrade is planned for Marsh Gibbon STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2025.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Marsh Gibbon.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Marsh Lane Bridge, Taplow
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Marston St Lawrence SPS
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Marsworth
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Mays Lane Overflow
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Melford Road, London, E11
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Merstham STW
An upgrade is planned for Merstham STW. This will improve its ability to treat the volumes of incoming sewage as well as providing a higher quality of treated effluent going to the river. We plan to complete this work in 2028.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Middle Barton STW
Middle Barton STW is being upgraded at a cost of over £1 million. This project will increase the capacity of the storm tanks. This will reduce the need for untreated sewage discharges during storm conditions. The scheme is due for completion in 2025.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Middleton Cheney STW
An upgrade is planned for Middleton Cheney STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2027.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Middleton Stoney
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Midgham
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Mill Green (Hatfield)
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Millbank, Crawley
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Milton-Under-Wychwood STW
An upgrade is being planned for Milton-under-Wychwood STW. This will provide a major increase in treatment capacity, to 43 litres per second, reducing the need for untreated discharges in wet weather. The project is likely to complete in 2026.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Milton-Under-Wychwood.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Mogden STW
There are a range of complex schemes underway at Mogden STW, including work to improve its ability to treat the volumes of incoming sewage. These schemes are likely to be ongoing until 2030.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Montrose Avenue/Blenheim Crescent
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Moreton Pinkney
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Moreton-in-Marsh
Moreton in Marsh STW is being upgraded to increase the capacity of the storm tanks. This will reduce the need for untreated sewage discharges during storm conditions. We plan to complete this work in 2027.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Moreton in Marsh.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Moreton-in-Marsh (Primrose Court)
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Moreton STW
An upgrade is planned for Moreton STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2028.
Mornington Crescent
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Mortimer STW
An upgrade is planned for Mortimer STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete before the end of 2024.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Mulberry Court, Hall Road
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
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Nags Head Lane (Brentwood)
An upgrade is planned for Brentwood STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in our next asset planning period (2025 - 2030) and will provide more detailed information once the work schedule is confirmed.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Ne Storm Relief Shadwell, King Edward Mem Park
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Near Sezincote Lodge
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Neasden Station
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Netherlands Road CSO
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
New Bedford Road, Luton
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
New Mill (Eversley Lower Common)
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Newbury STW
An upgrade is planned for Newbury STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2027.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Newmans Lane Pumping Station
Newmans Lane Pumping Station is being upgraded at a cost of over £5 million. This project will increase the capacity of the storm tanks. This will reduce the need for untreated sewage discharges during storm conditions. The scheme is due for completion in 2024.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Nightingale Lane
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Norfolk Street
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
North End Road CSO
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
North Weald STW
An upgrade is planned for North Weald STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2027.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
North West Storm Relief
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
(Northern) Low Level No 1 Brook Green
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Northleach STW
An upgrade is planned for Northleach STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Northumberland Street
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Nr Jnc Leagrave Road - Spencer Road
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Nutter Lane / Preston Drive, Wanstead
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
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Biscot Road CSO
We expect these locations to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Oak Hill Park CSO
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Oakentrough
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Oakley Road
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Ockham Road South Foul Sewer Overflow
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Ockley Road
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Old Palace Lane
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Opposite St Stephens Hall
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Outside 115 Wentworth Road
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Oxford STW
We're finalising plans for a major upgrade at Oxford STW, costing more than £130m. This will provide a significant increase in treatment capacity, larger storm tanks and a higher quality of treated effluent going to the river. We plan to complete this work in 2031.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Oxford.
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
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Pangbourne STW
Pangbourne STW is being upgraded at a cost of over £3 million. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Park Town South & West, Luton
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Passfield
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Pauls Pier
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Pavilion in Roxbourne Park
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Pease Pottage
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Penwith Road
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Peterborough Road 1
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Pinkham Way Storm Sewage O/F, London
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Portsmouth Road, Uxbridge Road
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Princes Risborough STW
An upgrade is planned for Princes Risborough STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2027.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Princes Risborough.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Priory Lane Storm, Mortlake
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Priory Road, Dartford (Foul)
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Prospect Road, Woodford
We expect this location to meet all government targets for storm overflows by 2030 - 2035.
Puller Road/Calvert Road Storm, Barnet
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Purton STW
An upgrade is planned for Purton STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2025.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Putney Bridge Street
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
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Queen Street
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
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Ramsbury STW
An upgrade is being planned for Ramsbury STW. This will provide a major increase in treatment capacity, from 27 to 53 litres per second. This will reduce the need for untreated discharges in wet weather. We expect the project to complete in 2025.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Ramsbury.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Ranelagh CSO
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Ratcliffe Highway Limekiln
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Ratley
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Ray Lodge Road (Ray Park 1)
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Reading STW
An upgrade is planned for Reading STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2028.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Reading.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Reading, Blakes Lock
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Reading, Caversham
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Redbridge Lane West, Wanstead
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Regent Street
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Ripley STW
An upgrade is planned for Ripley STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2027.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
River Lane
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Riverside STW
An upgrade is planned for Riverside STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2027.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Road A217, Burgh Heath
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Road A3, Roehampton Vale
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Roding Valley
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Rotherwick
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Rous Road, Buckhurst Hill
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Rowsham
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Ruislip Road East
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Rusper
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Rye Meads
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
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Salfords, Surrey
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Sandhurst STW
An upgrade is planned for Sandhurst STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2025.
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Savoy Street
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Selborne STW
An upgrade is planned for Selbourne STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Sevenhampton Village
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Shabbington STW
Shabbington STW is being upgraded at a cost of over £1 million. This will improve its ability to treat the volumes of incoming sewage and to increase the capacity of the storm tanks. This will reduce the need for untreated discharges in wet weather. The scheme is due to complete in 2025.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Shad, Thames
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Shamley Green STW
An upgrade is planned for Shamley Green STW. This will improve its ability to treat the volumes of incoming sewage as well as providing a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Sherfield-On-Loddon STW
An upgrade is planned for Sherfield-on-Loddon STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Shotteswell
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Shrivenham
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Shutford STW
An upgrade is planned for Shutford STW. This will improve its ability to treat the volumes of incoming sewage as well as providing a higher quality of treated effluent going to the river. We plan to complete this work in 2025.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Silchester STW
An upgrade is planned for Silchester STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is expected to complete in 2027.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Silchester.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Slough STW
Upgrades are planned for Slough STW. These will include an increase in treatment capacity, from 1150 to 1416 litres a second. This will provide a higher quality of treated effluent going to the river. This scheme will reduce the need for untreated discharges in wet weather. We plan to complete this work in 2029.
We expect this location to meet all government targets for storm overflows by 2035 - 2040.
Find out how we're investing in river health.
Smith Street
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Sonning Common STW
An upgrade is planned for Sonning Common STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
South Ealing Road, W5
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
South Lane, Ash
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
South Leigh STW
An upgrade is planned for South Leigh STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2025.
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
South Moreton STW
An upgrade is planned for South Moreton STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
South Norwood
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
South Park, Ilford
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Spooks Hill, North Holmwood
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
SSO, Junction Crane Valley/Bathroadse
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
St Andrews Road, Black Horse Lane
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
St Jamess Road
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
St Pauls Avenue CSO
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Stag Lane CSO
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Stamford Brook
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Standlake
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Standon STW
An upgrade is planned for Standon STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2028.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Stanford in the Vale STW
Stanford in the Vale STW is being upgraded at a cost of over £3 million. This project will increase the capacity of the storm tanks. This will reduce the need for untreated sewage discharges during storm conditions. The scheme is due for completion in 2024.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Stanford Rivers STW
An upgrade is planned for Stanford Rivers STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2029.
Stansted Airport
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Stansted Mountfitchet STW
An upgrade is planned for Stansted Mountfitchett STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
Stanton Fitzwarren STW
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Stanton Harcourt STW
An upgrade is planned for Stanton Harcourt STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2025.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Stewkley STW
An upgrade is planned for Stewkley STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Stoke Road, Cobham
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Stone STW
Stone STW is being upgraded at a cost of over £1 million. This will increase the capacity of the storm tanks. This will reduce the need for untreated sewage discharges during storm conditions. The scheme is due for completion in 2025.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Stonebridge Brook
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Stonebridge SSO, Brockham
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Streatham & Balham Storm Relief
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Streatham Storm Relief
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Streatham Vale Storm Relief
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Sunnyside Road
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
SW Storm Relief Sewer, London
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Swains Road
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Swindon (Rodbourne)
Two upgrades are planned at Swindon STW to improve the ability to treat incoming flows, and increase the capacity of the sludge stream, which will improve efficiency at the works. The schemes are due for completion in 2027 and 2030.
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
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Tackley
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Takeley - Garnets
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Takeley STW
An upgrade is planned for Takeley STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2028.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Taylors Crescent, Cranleigh
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Temple Place Essex Street
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Tetsworth STW
An upgrade is planned for Tetsworth STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Thame STW
An upgrade is planned for Thame STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2027.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
The Broadway (Ray Park 2)
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
The Willows, North Hinksey Lane
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Therfield STW
Therfield STW is being upgraded to increase the capacity of the storm tanks. This will reduce the need for untreated sewage discharges during storm conditions. The scheme will also ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Theydon Bois STW
An upgrade is planned for Theydon Bois STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Thornwood STW
An upgrade is planned for Thornwood STW. This will improve its ability to treat the volumes of incoming sewage as well as providing a higher quality of treated effluent going to the river. We plan to complete this work in 2027.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Thrale Roade
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Tideway CSO (offline)
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Tonstall Road
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Tree Tops, Norbury
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Tring
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Trumpers Way, W7
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Trumps Green
We expect this location to meet all government targets for storm overflows by 2030 - 2045. Find out how we're investing in river health.
Tubney SPS
We expect this location to meet all government targets for storm overflows by 2035 - 2040. Find out how we're investing in river health.
U
Uffington STW
An upgrade is planned for Uffington STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2025.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Uffington.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
V
Vauxhall Motors
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
W
Waddesdon STW
An upgrade is planned for Waddesdon STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2026.
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
Wanborough STW
An upgrade is planned for Wanborough STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2024.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Wandle Valley
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Wantage
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Wardington
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Wargrave STW
An upgrade is planned for Wargrave STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Warmington STW
An upgrade is planned for Warmington STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Wash Water STW
An upgrade is planned for Wash Water STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in 2024.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Wash Water.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Water End
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Waterloo Crescent Outfall, Wokingham
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Watery Lane, Startops End
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Watlington STW
Upgrades are planned for Watlington STW. These will include an increase in treatment capacity to 60 litres per second, as well as providing a higher quality of treated effluent going to the river. This scheme will reduce the need for untreated discharges in wet weather. We plan to complete this work in 2026.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Watlington.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Waverley Lane
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Wealdbridge, North Weald
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
West End, Essendon
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
West Heath, Ramsdell
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
West Putney Storm Relief CSO
This combined sewer overflow (CSO) is now connected to the London Tideway Tunnels system. This is intercepting flows that would have previously discharged to the river. The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames. The work has already produced a positive effect on the river.
Find out how we're investing in river health.
West Way, Botley (Syphon)
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Western PS Low Lever Sewer
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Western Way
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Weston (Herts) STW
An upgrade is planned for Weston STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2027.
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
Weston Park
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Weston-On-The-Green SPS
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Weston-On-The-Green STW
An upgrade is planned for Weston-On-The-Green STW. This scheme will ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2025.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Westway Close
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Weybridge
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Wheathampstead
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Wheatley
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
White Roding STW
White Roding STW is being upgraded at a cost of over £2 million. This will increase the capacity of the storm tanks. This will reduce the need for untreated sewage discharges during storm conditions. The scheme is due for completion in 2025.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
White Waltham
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Whitwell STW
An upgrade is planned for Whitwell STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme is due to complete in early 2025.
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Widford and Wareside
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Wildernesse, Shoreham
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Willingale STW
Willingale STW has been upgraded at a cost of over £2 million. This scheme increases the capacity of the storm tanks. This will reduce the need for untreated sewage discharges during storm conditions. This scheme was completed in early 2023.
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
Wimbledon Hill Road / Wimbledon Hill Wimbledon
We expect these locations to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Windsor STW
An upgrade is planned for Windsor STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2027.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Wingrave STW
An upgrade is planned for Wingrave STW. This scheme will ensure a higher quality of treated effluent going to the river, as well as improving its ability to treat the volumes of incoming sewage. We plan to complete this work in 2025.
We expect this location to meet all government targets for storm overflows by 2025 - 2030. Find out how we're investing in river health.
Winterbourne
We expect this location to meet all government targets for storm overflows by 2030. Find out how we're investing in river health.
Witney STW
Witney STW is being upgraded at a cost of more than £17 million. This work will provide a major increase in treatment capacity, from 240 to 399 litres per second. This will reduce the need for untreated discharges in wet weather. This work is expected to complete in 2025.
We're also investigating the impact of groundwater on the sewer network in this area. This will help inform our long-term planning.
See our groundwater impacted system management plan for Witney.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Woking STW
Woking STW is being upgraded to increase the capacity of the storm tanks. This will reduce the need for untreated sewage discharges during storm conditions. The scheme will also ensure a higher quality of treated effluent going to the river. We plan to complete this work in 2027.
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Wokingham (Ash Ridge) STW
An upgrade is planned for Wokingham STW. This will improve its ability to treat the volumes of incoming sewage, reducing the need for untreated discharges in wet weather. The scheme, which is still being designed, is due to complete in 2026.
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.
Wood Street
This is one of the 54 combined sewer overflows (CSOs) discharging to the tidal River Thames.
The Thames Tideway Tunnel is the third and final stage of a program to improve the quality of the Tidal Thames. This final stage will add to the work already undertaken to improve the health of the Thames which is already producing a positive effect on the river.
In an average year, 95% of the total volume of storm flows discharged to the Tidal Thames will be captured by the tunnel, depending on the weather.
We expect this location to meet all government targets for storm overflows by 2025. Find out how we're investing in river health.
Woodford Halse
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Woodstock STW
We completed a project at Woodstock STW to provide more reliable and accurate information relating to untreated discharges. This was completed in 2023.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Woodstock Road Oxford
We expect this location to meet all government targets for storm overflows by 2045 - 2050. Find out how we're investing in river health.
Worminghall STW
Worminghall STW is being upgraded at a cost of over £7 million. This scheme will ensure a higher quality of treated effluent going to the river, improving its ability to treat the volumes of incoming sewage. We expect the project to complete in 2024.
We expect this location to meet all government targets for storm overflows by 2040 - 2045. Find out how we're investing in river health.
Wynters Brook, Hastingwood
We expect this location to meet all government targets for storm overflows by 2030 - 2035. Find out how we're investing in river health.