Corwen WWTW STW - Wastewater Treatment Plant in Corwen, Wales

Corwen WWTW STW is a wastewater treatment works located on London Road in Corwen, Denbighshire, Wales. The plant serves a population of around 1,760 people, classifying it as a small agglomeration under UK water industry standards. It is situated inland, more than 10 km from the coast, and discharges treated effluent into the Dee River catchment. The plant provides secondary treatment, which is the standard biological treatment stage required for all discharges in the UK under the Urban Waste Water Treatment (England and Wales) Regulations. These regulations transpose the EU Urban Waste Water Treatment Directive, mandating secondary treatment for inland populations of this size. The plant has a designed capacity of 3,375 cubic meters per day and a reported discharge volume of 391.84 cubic meters per day, indicating it operates well below its capacity. The treated effluent from Corwen WWTW STW ultimately flows into the River Dee, which is a major river in North Wales. The Dee supports diverse aquatic life, including salmon and trout populations, and is an important water resource for the region. The river drains into the Dee Estuary, a ecologically sensitive area that provides habitat for migratory birds and marine species.

The plant discharges into the River Dee catchment, which flows through the Dee Valley and into the Dee Estuary, a large coastal inlet on the Irish Sea. The Dee Estuary is an important site for wading birds and wildfowl, supporting a rich ecosystem. The river itself is designated for its salmonid fisheries and overall ecological value, requiring careful management of wastewater discharges to maintain water quality.