Hafren Dyfrdwy

In July 2018, Severn Trent Water formed Hafren Dyfrdwy (meaning Severn Dee; named after the two major rivers in the area) to bring together all the Welsh customers previously served by Severn Trent and by Dee Valley Water.

For the first time, the 35,100 homes and 3,900 businesses in Powys and Monmouthshire who were previously Severn Trent customers joined Dee Valley customers based in Wales to be served by HD. The 49,700 homes who were previously Dee Valley Water customers in England are now served by Severn Trent.

Cownwy & Marchnant WFD Project (2021)

The River Marchnant and River Cownwy lie within the valley of Lake Vyrnwy, Powys. The purpose of this project is to provide environmental flow releases below the Cownwy and Marchnant diversion intakes that supply Vyrnwy Reservoir. The scheme will amend the existing structures to enable a 25/75% proportional flow split, including a Q99 hands-off flow. […]

Llwyn Onn WTW (2013)

The original Llwyn Onn WTW was constructed during World War II, to supply water for a munitions factory in Wrexham. Water is abstracted from the Dee and pumped to the Marchwiel Reservoir before treatment at Llwyn Onn. Raw water quality is reliable, but the upland sources in particular result in high levels of manganese. Although […]

Boughton WTW (2007)

Refurbishment for Dee Valley Water