Document library
Read important information relating to our services, tariffs, policies and supporting contractual documentation.
Wholesale service offering
Charges documents
2025-26
- Wholesale tariff document 2025-26pdf | 1.9 MB
- NAV tariff document 2025-26pdf | 792.7 KB
- Statement of board assurance for wholesale charges 2025-26pdf | 268.2 KB
- Statement of significant changes for wholesale charges 2025-26pdf | 211.8 KB
- CMOS tariff schedule - wholesale charges 2025-26xlsx | 25.3 KB
- Wholesale charges 2025-26 and AMP8 information documentpdf | 352.2 KB
- Wholesale invoicing timetable 2025-26pdf | 146.9 KB
- Non-primary billing timetable 2025-26pdf | 76.9 KB
- NAV billing timetable 2025-26pdf | 75.7 KB
- Nav tariffs onsite ongoing avoided costs 2025-26pdf | 400.1 KB
2024-25
- Wholesale tariff document 2024-25pdf | 1.8 MB
- NAV tariff document 2024-25pdf | 792.8 KB
- Statement of significant change for wholesale charges 2024-25pdf | 210.3 KB
- Statement of board assurance for wholesale charges 2024-25pdf | 223.8 KB
- CMOS tariff schedule - wholesale charges 2024-25xlsx | 25.3 KB
- Wholesale invoicing timetable 2024-25pdf | 131.2 KB
- Non-primary billing timetable 2024-25pdf | 72.7 KB
- NAV billing timetable 2024-25pdf | 74.1 KB
- NAV bulk charges 202-2025 - avoided costspdf | 372.8 KB
2023-24
- Wholesale tariff document 2023-24pdf | 1.8 MB
- NAV tariff document 2023-24pdf | 798.4 KB
- Statement of board assurance for wholesale charges 2023-24pdf | 227.5 KB
- Statement of significant change for wholesale charges 2023-24pdf | 203.9 KB
- CMOS tariff schedule - wholesale charges 2023-24xlsx | 24.3 KB
- Wholesale invoicing timetable 2023-24pdf | 127.1 KB
- Non-primary billing timetable 2023-24pdf | 67.9 KB
- Nav Billing Timetable 2023 24pdf | 69.1 KB
2022-23
- Wholesale tariff document 2022-23pdf | 1.8 MB
- Statement of board assurance for wholesale charges 2022-23pdf | 212.7 KB
- Non-household tariff templates 2022-23xlsx | 41.2 KB
- NAV billing timetable 2022-23pdf | 71.6 KB
- NAV tariff document 2022-23pdf | 599.4 KB
- Non-primary billing timetable 2022-23pdf | 63.2 KB
- Non-household annual charges calculator 2022-23xlsx | 38.4 KB
- Wholesale invoicing timetable 2022-23pdf | 140.4 KB
2021-22
- Statement of board assurance for wholesale charges 2021-22pdf | 560.5 KB
- NAV tariff document 2021-22pdf | 492.1 KB
- Wholesale tariff document 2021-22pdf | 1.7 MB
- Wholesale tariff guide 2021-22pdf | 304.8 KB
- Wholesale invoicing timetable 2021-22pdf | 412.4 KB
- Non-primary billing timetable 2021-22pdf | 380.3 KB
- Non-household annual charges calculator 2021-22xlsx | 38 KB
- Non-household tariff templates 2021-22xlsx | 64.5 KB
2020-21
- Wholesale invoicing timetable 2020-21pdf | 513.7 KB
- Non-household tariff templates 2020-21xlsx | 57.7 KB
- Statement of assurance 2020-21pdf | 2.1 MB
- Statement of significant change 2020-21pdf | 2 MB
- Wholesale tariff document 2020-21pdf | 1.7 MB
- NAV tariff document 2020-21pdf | 484.9 KB
- Statement of significant change indicative wholesale charges 2020-21pdf | 5.8 MB
2019-20
- NAV tariff document 2019-20pdf | 634.7 KB
- Wholesale invoicing timetable 2019-20pdf | 300.3 KB
- Wholesale tariff document (re-issued)pdf | 1.6 MB
- Non-household annual charges calculator 2019-20xlsx | 33.2 KB
- Statement of assurance 2019-20pdf | 1.7 MB
- Non-household tariff templates 2019-20xlsx | 56.4 KB
- Indicative wholesale charges schedule 2019-20pdf | 360.7 KB
- Statement of significant change for indicative wholesale charges 2019-20pdf | 2.2 MB
2018-19
- Wholesale invoicing timetable 2018-19pdf | 310.4 KB
- Wholesale tariff document 2018-19pdf | 1.6 MB
- Wholesale tariff guide 2018-19pdf | 218.7 KB
- Non-household annual charges calculator 2018-19xlsx | 40.2 KB
- Assurance statement wholesale charges 2018-19pdf | 1.9 MB
- Thames Water non-household wholesale tariffs 2018-19xls | 50.3 KB
- Indicative wholesale charges schedule 2018-19pdf | 349.1 KB
- Statement of assurance for indicative wholesale charges schedule 2018-19pdf | 1.8 MB
Applications and contracts
- Wholesale contractpdf | 156 KB
- Wholesale supply application formpdf | 37.7 KB
- Common carriage application formpdf | 146.4 KB
- S1 secondary supplies initial enquiry formpdf | 57.8 KB
- Draft confidentiality agreementpdf | 68.1 KB
- Wholesale services agreement - combined supplypdf | 130.5 KB
- WIRSAE Memorandum of Understandingpdf | 237.6 KB
Policies
- Leakage code of practicepdf | 371 KB
- Thames Water WIRSAE addendumpdf | 171.5 KB
- Gap site incentive schemepdf | 176.5 KB
- Honest and ethical behaviour policypdf | 401.2 KB
- Metering policypdf | 603.6 KB
- Metering menupdf | 160.3 KB
- Sensitive customers code of practicepdf | 238.3 KB
- Private blockages code of practicepdf | 390.3 KB
- Disconnections and reconnections code of practicepdf | 287.7 KB
Access code and compliance code
Alternative credit support agreements
- ADSM 01-04-2025pdf | 145.2 KB
- Anglian Water 01-04-2025pdf | 149.6 KB
- Arla Foods 01-04-2025pdf | 153.3 KB
- BT Guarantee 26-03-2024pdf | 264.5 KB
- Castle Water 01-04-2025pdf | 143.4 KB
- Clear Business Water 01-04-2025pdf | 143.4 KB
- Coca Cola 01-04-2025pdf | 149.6 KB
- ConservAqua 01-04-2025pdf | 164.7 KB
- David Lloyd Leisure 01-04-2025pdf | 143.4 KB
- Elis 01-04-2025pdf | 153 KB
Previous years
- ADSM 04-03-2024pdf | 127.9 KB
- ADSM 05-10-2023pdf | 215.6 KB
- ADSM 04-04-2023pdf | 140.5 KB
- ADSM 29-03-2022pdf | 149 KB
- Anglian Water 14-02-2025pdf | 131.8 KB
- Anglian 24-03-2022pdf | 150.8 KB
- Anglian 01-04-2021pdf | 147.1 KB
- Arla Foods 01-03-2024pdf | 129.4 KB
- Arla Foods 25-04-2023pdf | 141.1 KB
- Arla Foods 17-03-2022pdf | 149.4 KB
We're active members of the Retailer Wholesaler Group and we're working to align with their good practice guidance.