We’ve been working to install a new trunk main on the A24. This is a £15m major infrastructure investment to reduce supply interruption and improve water supply. The replacement pipe covers 2.4km along the A24 and is a major part of our clean water network.
We’ll soon be completing the final sections of the trunk main. This involves installing valves and fittings to connect the main to our network.
We’ve had some recent challenges around pressure-testing the new main. We've designed and installed bespoke valves and fittings to overcome this. As a result, we've had to amend the works programme. Our works are on schedule despite this, so we still expect to complete the scheme in July 2025.
We appreciate that these works have been disruptive. We apologise for any additional inconvenience caused by the change of programme.
This page was last updated on 20 June 2025.
Our working hours will be Monday to Friday, 7am to 6pm and weekends 8am to 5pm.
These junctions on the A24 will close as part of the approved traffic management plan:
Street name |
Start of closure |
End of closure |
---|---|---|
Derinton Road |
25 April 2025 | 26 June 2025 |
Lessingham Avenue |
25 April 2025 | 26 June 2025 |
Ansell Road |
25 April 2025 | 26 June 2025 |
Balham Park Road |
7 January 2025 | 9 July 2025 |
Trevelyan Road | 13 May 2025 | 23 July 2025 |
If you have any questions, call us on 0800 316 9800 or email customer.feedback@thameswater.co.uk. Quote number: BB70085755.
For business customers, please contact your retailer for information relating to our work.
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Sliplining technique being used
Upper Tooting road launch pit
Lidar survey
6no. BT ducting that was encased in concrete above the live 30” CI