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 CorporationCarlisle CorporationLiverpool CorporationManchester CorporationSt. Helens CorporationWidnes CorporationCalder Water BoardEden Water BoardFurness Water BoardFylde Water BoardLakes and Lune Water BoardLune Valley Water BoardMacclesfield District Water BoardMakerfield Water BoardMid Cheshire Water BoardNorth Calder Water BoardPreston and District Water BoardSouth Cumberland Water BoardStockport and District Water BoardWarrington, Runcorn and District Water BoardWest Cumberland Water BoardWest Lancashire Water BoardWest Pennine Water BoardWirral Water Board