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Isle of Man Water and Sewerage Authority
The Isle of Man Water and Sewerage Authority (Manx: ''Lught-reill Ushtey as Sornaigys Ellan Vannin'') is the Statutory Board responsible for water supply and sewage disposal in the Isle of Man. It was formed in 1972 as the 'Isle of Man Water Authority' by the merger of the Isle of Man Water Board and the Water Department of Douglas Corporation. In 1974 it took over the gas production and distribution functions of the Isle of Man Gas Authority, and was renamed the 'Isle of Man Water and Gas Authority'. In 1985 the gas undertaking was privatised, and the Authority reverted to its original title. It was renamed the 'Isle of Man Water and Sewerage Authority' in 2010, taking over the sewerage responsibilities of the former Department of Transport.〔Transfer of Functions (New Departments) (No.2) Order 2010 (Statutory Document 155/10) ()〕
==Distribution system==
The water supply system starts with ten impounding reservoirs located in the uplands of the Isle of Man, the first of which was constructed in 1875, and the most recent, Sulby Reservoir, in 1982. Together they hold thousands of millions of gallons.
Water is then distributed via gravity through of large diameter mains to one of the treatment plants, either at Sulby (opened in October 2005) or Douglas (opened in February 2008).
From the treatment centres, the water then flows to 33 underground service reservoirs. Gravity or one of thirteen pumping stations then take the water to its end-users. There are over of treated water mains.
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