§ Water Service Companies
- Anglian Water Services Limited
- North West Water Limited
- Northumbrian Water Limited
- Severn Trent Water Limited
- South West Water Services Limited
- Southern Water Services Limited
- Thames Water Utilities Limited
- Wessex Water Services Limited
- Yorkshire Water Services Limited
§ Statutory Water Companies
- Bournemouth and District Water Company
- Bristol Waterworks Company
- Cambridge Water Company
- Chester Waterworks Company
- Cholderton and District Water Company
- Colne Valley Water Company
- East Anglian Water Company
- Eastbourne Water Company
- East Surrey Water Company
- East Worcestershire Waterworks Company
- Essex Water Company
- Folkestone and District Water Company
- Hartlepools Water Company
- Lee Valley Water Company
- Mid Kent Water Company
- Mid Southern Water Company
- Mid Sussex Water Company
- Newcastle and Gateshead Water Company
- North Surrey Water Company
- Portsmouth Water Company
- Rickmansworth Water Company
- South Staffordshire Water Company
- Sunderland and South Shields Water Company
- Sutton and District Water Company
- Tendring Hundred Water Company
- West Hampshire Water Company
- West Kent Water Company
- York Waterworks Company