ALSAGER STW Wastewater Treatment Plant, Lawton Heath End, England

ALSAGER STW is a wastewater treatment plant located near Lawton Heath End in Cheshire East, England. It serves a population of around 13,304, placing it in the medium agglomeration category under UK regulatory frameworks. The plant is situated inland, away from coastal areas, and its operations are part of the broader water infrastructure managed by regional water authorities. Under the UK's transposition of the EU Urban Waste Water Treatment Directive (UWWTD), plants serving populations between 10,000 and 150,000 are generally required to provide secondary treatment as a minimum. For sensitive areas, more stringent treatment may be mandated. It is expected to comply with these national standards. The treated effluent from ALSAGER STW is discharged into local watercourses that ultimately drain into the River Weaver and then into the River Mersey estuary, which flows into the Irish Sea. This catchment supports diverse aquatic life and is important for regional biodiversity. The plant plays a key role in protecting water quality in this inland watershed.

ALSAGER STW discharges into local streams that feed the River Weaver, a major tributary of the River Mersey. The Mersey estuary is a vital ecological corridor supporting migratory fish and bird species. The plant's operations help maintain water quality in this sensitive freshwater-to-estuarine transition zone, which is important for both wildlife and downstream communities.