Coppermills Water Treatment Works (London)

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In the mid 19th century the East London Waterworks Company purchased the Coppermill at Walthamstow and modified it to drive a water pump to assist in the building of reservoirs on nearby marshland in the Lea Valley.

The company built a series of reservoirs which were High Maynard Reservoir, Low Maynard Reservoir, five linked numbered reservoirs making the Walthamstow Reservoirs, the East Warwick Reservoir and the West Warwick Reservoir.

The Coppermills Water Treatment Works was completed in 1969 and is owned and managed by Thames Water.

In 2005, work was undertaken to link the works to the London ring main via the Northern Extension tunnel.

It was completed in 2009 and enables the facility to be a major supplier of water to the London area