COALEY STW - Stroud, Gloucestershire Wastewater Treatment Plant

COALEY STW is a wastewater treatment plant located in Coaley, near Stroud, Gloucestershire, England. It serves a population of approximately 20,795, placing it in the medium agglomeration category under UK regulations. The plant is part of the region's wastewater infrastructure managed by the local water authority. As a UK wastewater treatment plant, COALEY STW is subject to 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, with tertiary treatment in sensitive areas. The plant's designed capacity is 1.00 (likely in megaliters per day or similar unit), indicating its scale. The plant discharges treated effluent into the local water environment, ultimately draining into the River Severn catchment and the Severn Estuary. The Severn Estuary is an ecologically important area supporting diverse aquatic life and migratory fish species. The plant's location within 50 km of the coast means its discharge can influence coastal water quality.

COALEY STW discharges into the River Severn catchment, which flows into the Severn Estuary and then the Bristol Channel. The Severn Estuary is a major ecological corridor supporting migratory fish like salmon and eels, as well as bird populations. The plant's effluent contributes to the nutrient load in the estuary, requiring careful management to prevent eutrophication.