Strabane Wastewater Treatment Plant, Sion Mills, Northern Ireland

Strabane wastewater treatment plant is located in Sion Mills, County Tyrone, Northern Ireland, within the Derry and Strabane District. The facility serves a population of approximately 20,305, classifying it as a medium agglomeration under EU regulations. It plays a key role in managing wastewater for the local community and surrounding areas. As a plant operating under the EU Urban Waste Water Treatment Directive (91/271/EEC), Strabane is required to meet secondary treatment standards for its population tier. The directive mandates that agglomerations between 10,000 and 150,000 population equivalent receive secondary treatment, with more stringent requirements if discharging into sensitive areas. The treated effluent from Strabane likely discharges into a local watercourse that flows into the River Foyle system, which ultimately reaches Lough Foyle and the Atlantic Ocean. The River Foyle supports diverse aquatic life and is an important migratory corridor for salmon and sea trout. The plant's operations contribute to protecting water quality in this ecologically significant catchment.

The Strabane plant discharges into the River Foyle catchment, which flows northward into Lough Foyle and the Atlantic Ocean. The River Foyle is a key salmonid river, supporting Atlantic salmon and brown trout populations. The estuary and lough provide important habitats for migratory birds and marine species. Protecting water quality in this system is critical for maintaining biodiversity and supporting local fisheries.