POTTERNE STW - Devizes, Wiltshire Wastewater Treatment Plant

POTTERNE STW is a wastewater treatment works located in Potterne, near Devizes, Wiltshire, England. It serves a population of around 11,365, classifying it as a medium agglomeration under UK regulations. The plant is part of the regional infrastructure managed by the UK water industry, operating under the Water Industry Act 1991 and environmental permitting by the Environment Agency. As a secondary treatment plant, POTTERNE STW is expected to meet the standards set by the Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary biological treatment for agglomerations of this size. The plant's capacity and treatment processes are designed to handle the organic load from the local community, ensuring compliance with discharge permits that protect receiving water quality. The treated effluent from POTTERNE STW is discharged into local watercourses that drain into the River Avon (Bristol Avon), which flows through Wiltshire and into the Severn Estuary. This catchment supports diverse aquatic life and is important for regional biodiversity. The plant plays a key role in maintaining water quality in the Avon, which is used for recreation and supports downstream ecosystems.

POTTERNE STW discharges into the Bristol Avon catchment, which flows through Wiltshire and eventually into the Severn Estuary. The Avon is a chalk stream, a rare and ecologically sensitive habitat that supports species such as brown trout and Atlantic salmon. The plant's treatment helps protect this river system from nutrient pollution and organic enrichment, which is critical for maintaining the health of the estuary and its migratory fish populations.