Horncastle STW - Wastewater Treatment Plant in East Lindsey, Lincolnshire

Horncastle STW is a wastewater treatment plant located in East Lindsey, Lincolnshire, England, serving a population of approximately 7,365. The plant is situated near the A153 road in the village of Dalderby, within the Lincolnshire Wolds area. It is part of the UK's wastewater infrastructure managed under the Water Industry Act 1991. As a facility serving a small agglomeration, it is expected to meet secondary treatment standards under the Urban Waste Water Treatment Directive (UWWTD) transposed into UK law. The plant is operated by a licensed water company, with regulatory oversight from the Environment Agency. Horncastle STW discharges treated effluent into local watercourses that drain into the River Bain, a tributary of the River Witham. The Witham flows into The Wash, an ecologically important estuary and a designated Site of Special Scientific Interest (SSSI). The plant plays a key role in protecting water quality in this sensitive downstream environment.

The treated effluent from Horncastle STW enters local watercourses that feed into the River Bain, which joins the River Witham near Boston. The Witham flows into The Wash, a large estuary on the east coast of England that supports diverse birdlife, including migratory waders and wildfowl. The Wash is also important for fisheries and marine life. The plant's discharge must meet strict quality standards to protect this ecologically sensitive area from nutrient enrichment and pollution.