UK's Water Companies

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Thames Water Utilities Ltd, known as Thames Water, is a large private utility company responsible for the water supply and waste water treatment in most of Greater London, Luton, the Thames Valley.

Anglian Water is a water company that operates in the East of England. It was formed in 1989 under the partial privatisation of the water industry. It provides water supply, sewerage and sewage treatment to the area formerly the responsibility of the Anglian Water Authority.

Severn Trent plc is a water company based in Coventry, England. It supplies 4.6 million households and business across the Midlands and Wales. It is traded on the London Stock Exchange.

Yorkshire Water is a water supply and treatment utility company servicing West Yorkshire, South Yorkshire, the East Riding of Yorkshire, part of North Lincolnshire, most of North Yorkshire and part of Derbyshire, in England.

South West Water provides drinking water and waste water services throughout Devon and Cornwall and in small areas of Dorset and Somerset. South West Water was created in 1989 with the privatisation of the water industry.

Southern Water is the private utility company responsible for the public wastewater collection and treatment in Hampshire, the Isle of Wight, West Sussex, East Sussex and Kent, and for the public water supply and distribution in approximately half of this area.

Northumbrian Water Limited is a water company in the United Kingdom, providing mains water and sewerage services in the English counties of Northumberland, Tyne and Wear, Durham and parts of North Yorkshire, and also supplying water as Essex and Suffolk Water.

Wessex Water Services Limited, known as Wessex Water, is a water supply and sewerage utility company serving an area of South West England, covering 10,000 square kilometres including Bristol, most of Dorset, Somerset and Wiltshire and parts of Gloucestershire and Hampshire.

United Utilities Group plc, the United Kingdom's largest listed water company, was founded in 1995 as a result of the merger of North West Water and NORWEB.

Bristol Water is a British water company which supplies 266 million litres of drinking water daily to over 1.2 million customers in a 2,600 km² area centred on Bristol, England. It is regulated under the Water Industry Act 1991. Sewerage services in the Bristol area are provided by Wessex Water.