North West Water was a water supply company serving north west England. It was originally the North West Water Authority, one of ten regional authorities created by the Water Act 1973. In 1989 it became North West Water plc, and was privatised. In 1995 it merged with Norweb (the former North Western Electricity Board) to form United Utilities.
The North West Water Authority took over the following statutory water undertakings:
Bolton Corporation
Carlisle Corporation
Liverpool Corporation
Manchester Corporation
St. Helens Corporation
Widnes Corporation
Calder Water Board
Eden Water Board
Furness Water Board
Fylde Water Board
Lakes and Lune Water Board
Lune Valley Water Board
Macclesfield District Water Board
Makerfield Water Board
Mid Cheshire Water Board
North Calder Water Board
Preston and District Water Board
South Cumberland Water Board
Stockport and District Water Board
Warrington, Runcorn and District Water Board
West Cumberland Water Board
West Lancashire Water Board
West Pennine Water Board
Wirral Water Board
