Westhoughton STW: Wastewater Treatment Plant in Westhoughton, Greater Manchester

Westhoughton STW is a wastewater treatment plant located in Westhoughton, a town in the Metropolitan Borough of Bolton, Greater Manchester, England. The plant serves a population of around 28,906, making it a medium-sized facility within the UK's wastewater infrastructure. It is situated inland, more than 50 km from the coast, and its operations are regulated under the UK's environmental permitting regime. As a plant serving a population between 10,000 and 100,000, Westhoughton STW is expected to provide secondary treatment or equivalent under the Urban Waste Water Treatment (England and Wales) Regulations, which transpose the EU Urban Waste Water Treatment Directive. The designed capacity is 1.00 (likely in megalitres per day or similar units), indicating the plant's scale. Typical UK plants of this size employ activated sludge or biological filtration systems. The treated effluent from Westhoughton STW is discharged into local watercourses that ultimately drain into the River Douglas, a tributary of the River Ribble, which flows into the Irish Sea. The plant plays a key role in protecting the water quality of these rivers and the downstream estuary, supporting aquatic life and recreational uses.

Westhoughton STW discharges into the River Douglas catchment, which flows into the River Ribble and then the Irish Sea. The Ribble Estuary is an ecologically important area supporting diverse birdlife and fish species. The plant's treatment helps reduce nutrient and pollutant loads, protecting downstream habitats from eutrophication and contamination. The region's industrial history and urban runoff also influence water quality management.