Preston Clifton Marsh STW: Major Wastewater Treatment Plant in Fylde, Lancashire

Preston Clifton Marsh STW is a major wastewater treatment facility serving the Fylde area of Lancashire, England, with a population equivalent of over 250,000. Located near the village of Freckleton, the plant is part of the region's critical water infrastructure, managed under the UK's regulatory framework. As a large agglomeration exceeding 150,000 population equivalent, the plant is required to meet stringent treatment standards under the Urban Waste Water Treatment Directive (UWWTD) transposed into UK law. Facilities of this scale typically employ secondary treatment with nutrient removal to protect sensitive receiving waters. The plant discharges treated effluent into the River Ribble estuary, which flows into the Irish Sea. This estuary supports important bird populations and migratory fish species. The Ribble catchment drains much of Lancashire, and the plant's performance is vital for maintaining water quality in this ecologically significant coastal environment.

The plant discharges into the River Ribble estuary, a major tidal waterway that flows into the Irish Sea. The estuary supports diverse aquatic life, including salmon and sea trout, and is an important feeding ground for wading birds. Downstream, the Irish Sea receives the Ribble's waters, contributing to the broader marine ecosystem of the eastern Irish Sea basin.