Tangmere STW - Wastewater Treatment Plant in Chichester, West Sussex, England

Tangmere STW is a wastewater treatment facility located in East Hampnett, near Chichester, West Sussex, England. It serves the village of Tangmere and surrounding areas, with a population equivalent of around 4,873. The plant is part of the UK's wastewater infrastructure, regulated under the Water Industry Act 1991 and overseen by the Environment Agency. As a small agglomeration, Tangmere STW is expected to provide secondary treatment in line with the EU Urban Waste Water Treatment Directive (91/271/EEC), which the UK has retained post-Brexit. The facility operates under a permit issued by the Environment Agency, which sets discharge consent conditions to protect receiving waters. The treated effluent from Tangmere STW is discharged into local watercourses that eventually drain into the English Channel. The area is part of the Sussex coast catchment, which supports diverse aquatic habitats and is important for migratory fish. The plant's operation helps maintain water quality in the region's chalk streams and coastal environment.

Tangmere STW discharges into local streams that flow into the River Lavant or directly towards Chichester Harbour, a designated Site of Special Scientific Interest (SSSI) and part of the Solent Maritime Special Area of Conservation (SAC). The harbour supports important bird populations and seagrass beds. The plant's discharge must meet strict nutrient standards to protect this sensitive coastal ecosystem from eutrophication.