In February 2017,  Dee Valley Water joined the Severn Trent group. On 1 July 2018, the boundaries of the two companies aligned to the
border between England and Wales whilst Dee Valley was renamed Hafren Dyfrdwy.

We supply wonderful water to homes and businesses in the areas of Wales that were previously served by Dee Valley, as well as Powys and Monmouthshire.  

The area highlighted in green on the map highlights the Hafren Dyfrdwy region, alongside the neighbouring Severn Trent region in white.