- Albion Water
- Anglian Water
- Sembcorp Bournemouth Water
- Bristol Water
- Cambridge Water
- Cholderton Water
- Dee Valley Water
- Dŵr Cymru – Cymraeg
- Dŵr Cymru – English
- Independent Water Networks
- Networks connected to Anglian Water networks
- Networks connected to Thames Water networks
- Northumbrian Water
- Peel Water Networks
- Portsmouth Water
- Severn Trent Water
- South East Water
- South Staffordshire Water
- South West Water
- Southern Water
- SSE Water
- Sutton and East Surrey Water
- Thames Water
- United Utilities Water
- Veolia Water Central
- Veolia Water East
- Veolia Water Projects
- Veolia Water Southeast
- Wessex Water
- Yorkshire Water