Billinge South STW - Wastewater Treatment Plant in St Helens, England

Billinge South STW is a wastewater treatment plant located in St Helens, within the Liverpool City Region of England, United Kingdom. It serves a population of approximately 6,295 people, placing it in the small agglomeration category under UK regulatory frameworks. As a UK wastewater facility, Billinge South STW is subject to the Urban Waste Water Treatment (England and Wales) Regulations 1994, which transpose the EU Urban Waste Water Treatment Directive. The plant has a designed capacity of 1.00, though units are unspecified. The plant discharges treated effluent into local watercourses that ultimately drain into the Irish Sea via the Mersey Estuary. The receiving waters support diverse aquatic life and are important for regional biodiversity, with the Mersey Estuary serving as a key habitat for migratory birds and fish species.

Billinge South STW discharges into local streams that flow into the Mersey Estuary, which then empties into the Irish Sea. The Mersey Estuary is an ecologically sensitive area that supports a variety of bird species and fish, including Atlantic salmon. The plant's operations help protect water quality in this downstream environment, which is important for both wildlife and recreational use.