Jersey Water

The New Jersey Waterworks Company Ltd, known as Jersey Water, is a public utility |public utility company responsible for the water supply for the island of Jersey. It supplies 19.3 million litres of water per day to over 40,000 households and has a total monopoly over the supply of water distribution network | mains water to the island.
Jersey Water operates all of Jersey's water supply infrastructure, including six reservoirs, two water treatment facilities, eight water extraction | water abstraction points and a desalination plant. It is also responsible for the operation and maintenance of the water distribution network | mains water network.
Jersey Water is regulated under the Water (Jersey) Law 1972, the Water Pollution (Jersey) Law 2000, the Reservoirs (Jersey) Law 1996, and the Water Resources (Jersey) 2007. It was privately owned until 1981 when the States of Jersey purchased a controlling share of roughly 74%.
== History ==
=== Previous water companies ===
The first company to supply water to Jersey was The Jersey Waterworks Company, established in 1863. It did not start supplying water until 1869, following an outbreak of cholera in St. Helier in 1867. It intended to supply water using a system of wells constructed in Vicart and Waterworks Valley, with water first being supplied from a well in Vicart. The wells proved unreliable and the company ran into financial difficulties, until it was declared en désastre in 1874 and the Royal Court appointed administrators to look after the company's affairs until a new company could be formed. In 1875, The St. Helier Waterworks Company Ltd. was created but it never supplied any water.
=== Pre-1940 ===
The New Jersey Waterworks Company Ltd. was founded on the 11 February 1882. It sunk several wells in St. Lawrence and St. Peter's valleys, and constructed a service reservoir at Mont Félard. The New Jersey Waterworks Company also found wells unreliable, and decided to transition to surface water supplies, beginning construction of Millbrook reservoir, Jersey | Millbrook reservoir and treatment works in 1893. Construction of the reservoir and treatment works were completed in 1895.
In 1909, the company constructed Dannemarche reservoir as an additional storage reservoir north of Millbrook reservoir. In 1932, Handois reservoir was constructed to serve as a third raw water storage reservoir north of Dannemarche reservoir.
The Handois treatment works were constructed in 1934 to replace the Millbrook treatment works. The Millbrook treatment works were shut down and converted into a water quality laboratory in the same year.
=== 1940-Present ===
Construction of new water infrastructure was halted during the German occupation of the Channel Islands due to material shortages, but after the war several new projects were completed including an extension to the Handois Treatment Works in 1949, the construction of Grands Vaux reservoir in 1953, and the construction of Val de la Mare reservoir in 1962.
In 1964, the Augrès treatment works were constructed, increasing the maximum daily capacity by 20Ml/day. La Rosière desalination plant was constructed in 1970 to allow consistent water supply during periods of drought. It originally used multi-stage flash distillation to distil seawater but was upgraded in 1999 to use reverse osmosis.
The States of Jersey purchased a controlling share in the company of 74% in 1981, placing it in state ownership | public ownership for the first time. The most recent reservoir to be constructed as of 2021, Queen's Valley reservoir was constructed in 1991. The water quality laboratory at Millbrook was redeveloped in 2002 to allow testing of over 7,000 samples per year. The New Jersey Waterworks Company Ltd. adopted the trading name Jersey Water in November 2004.
== Performance ==
Every day, Jersey Water water extraction, water treatment, and water supply 19.3 million litre of potable water to over 40,000 households through 580metre of water distribution system to over 40,000 households. It operates six reservoirs, two water treatment plants, and a desalination plant.
=== Leakage ===
In 2020, Jersey Water's average daily leakage was 2.46Ml/day, an increase from the average of 2.40Ml/day in 2019.1.2km of mains water pipes were renewed in 2020 to reduce the rate of leakage.
== Reservoirs ==
 Reservoirs operated by Jersey Water
Name 	Location 	Year Constructed	Max Capacity (litre|megalitres)	Max depth (metre|metres)	Dam Height (metre|metres)
Dannemarche reservoir 	St. Lawrence	1909 	93.0 	7.9 	7.9
Grands Vaux reservoir 	St. Saviour 	1953 	229.6 	9.5 	-
Handois reservoir 	St. Lawrence	1932 	187.5 	4.0 	7.3
Millbrook reservoir 	St. Lawrence	1895 	43.1 	3.5 	6.0
Queen's Valley reservoir 	Grouville 	1991 	1193.0 	20 	24
Valle de la Mare reservoir	St. Ouen 	1962 	938.7 	32.8 	24.3
Category:Utilities of the United Kingdom
Category:Companies established in 1882