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In 1989 the Thames Water Authority was partly privatised, under the provisions of the Water Act 1989 [3] with the water and sewage responsibilities transferring to the newly established publicly quoted company of Thames Water, and the regulatory, land drainage and navigation responsibilities transferring to the newly created National Rivers Authority which later became the Environment Agency.
In 2009, Coppermills was connected to the Thames Water Ring Main via the Northern Extension Tunnel, enabling the facility to be a major supplier of water to the whole London area. [2] It is capable of supplying a maximum of 680 million litres (150,000,000 imp gal; 180,000,000 US gal) of water per day.
In March 2003 Thames Water identified that by 2005 there would be a deficit in water treatment and supply capacity in North London. To address this deficit a new water treatment facility was constructed on 1.5 ha site adjacent to the William Girling reservoir and the A110 road ( 51°38′11″N 0°00′57″W / 51.63629°N 0.01582°W ...
Although earlier small-scale water supply operations existed, the New River Company was the first water supply company and is the earliest direct ancestor of Thames Water today. [ 1 ] During the 1850s, John Snow and William Farr 's identification of the 1854 Broad Street cholera outbreak provided a stimulus for the better treatment of sewage.
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Water is abstracted from the River Thames downstream of Penton Hook Weir at up to 200,000,000 imp gal (910,000,000 L; 240,000,000 US gal) [8] and flows via the 1.26 km Laleham Aqueduct to a pumping station (51°24'56.0"N 0°28'36.9"W) at the western embankment of the reservoir. The pumping station lifts water into the reservoir.
Built in 1931–36 by Middlesex County Council and now operated by Thames Water, it is the third largest sewage works in the United Kingdom. It treats the waste water from about 1.9 million people served by three main sewers serving more than the northwest quarter of Outer London and two further main sewers from the south and south-west.