Bristol Water supplies 266 million litres of drinking water daily to over 1.2 million customers in a 2,600 km2 (1,000 sq mi) 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.

Approximately half the water is taken from the Mendip Hills, particularly Chew Valley Lake, Blagdon Lake, Cheddar Reservoir and Barrow Gurney Reservoirs, with the other half piped from the River Severn via the Gloucester and Sharpness Canal. There are 6,772 km (4,208 mi) of local water mains.

On 5 October 2011, a subsidiary of Capstone Infrastructure Corporation acquired a 70% interest in Bristol Water from Grupo Agbar, who retained a 30% interest in the company. On 10 May 2012, a subsidiary of Itochu Corporation acquired a 20% indirect interest in Bristol Water. Today, iCON Infrastructure has agreed to acquire a 30 percent stake in Bristol Water from Suez, bringing the 10-year relationship with Agbar (now part of Suez) to a natural end, following the takeover in 2006 and the sale of a 70 percent stake in 2011. In 2018, Bristol Water was owned by iCON Infrastructure Partners III, L.P. (50 percent), iCON Infrastructure Partners III (Bristol), L.P. (30 percent) and Itochu Corporation (20 percent) and is a plc with company number 02662226. Bristol Water is one of the very few water companies in the UK that has remained in private ownership since its inception.