Cowbridge STW (Sewage Treatment Works), Cowbridge, Vale of Glamorgan, Wales

Cowbridge STW (Sewage Treatment Works) is a municipal wastewater treatment facility located on St. Athan Road in Llanblethian, Cowbridge, Vale of Glamorgan, Wales. The plant serves a population of around 6,545 people, placing it in the small-to-medium agglomeration category under UK regulations. As a plant in the United Kingdom, Cowbridge STW operates under the Urban Waste Water Treatment (England and Wales) Regulations, which transpose the EU Urban Waste Water Treatment Directive. For agglomerations of this size, secondary treatment is typically required. The plant's designed capacity is 1.00 (likely in megalitres per day or similar unit), indicating a modest scale. The treated effluent from Cowbridge STW is discharged into local watercourses that flow into the Bristol Channel, a major estuary and important ecological area. The receiving waters support diverse aquatic life and are part of the Severn Estuary ecosystem, which is recognized for its migratory fish and bird populations. The plant's proximity to the coast (within 50 km) means its discharge quality is important for protecting coastal water quality.

Cowbridge STW discharges into local streams that drain into the Bristol Channel, a large estuary with significant ecological importance. The Bristol Channel supports diverse marine life, including fish, crustaceans, and bird species, and is a key migratory route for salmon and eels. The plant's location within 50 km of the coast means its treated effluent must meet strict quality standards to protect the sensitive coastal and estuarine environment.