The Water Corporation was established as a body corporate under the Water Corporation Act 1995 and assumed the functions of the Water Authority of Western Australia on 1 January 1996. The Water Corporation is now the principle water utility for Western Australia and provides water, wasterwater, drainage and irrigation services to the State.

The Water Authority of Western Australia held responsiblity for the construction, operation, maintenance and control of water, sewerage and main drainage facilities within the State. The Water Authority was formed in July 1985 and merged the Metropolitan Water Authority with the country water activities of the Public Works Department. The Water Authority was replaced by the Water Corporation on 1 January 1996.