Affinity Water
Albion Water
Anglican Water Services Ltd
Bournemouth Water
Bristol Water
Dee Valley Water
DWR Cymru Welsh Water
Independent Water Networks Limited

Northumbrian Water
Peel Water
Portsmouth Water
Severn Trent Water
Southern Water
South East Water
South Staffs Water
South West Water
SSE Water Limited
Sutton and East Surrey Water

Thames Water
United Utilities
Wessex Water
Yorkshire Water

Advance Demand Side Management
Affinity for Business (Retail) Limited
Cambrian Utilities Limited
Clear Business Water Limited

Pennon Water Services Limited
Regent Water Limited
Scottish Water Business Stream Limited
SES Business Water

Three Sixty Water Limited
The Water Retail Company
Water 2 Business Limited
Water Plus
Yorkshire Water Business
Yu Water Limited