KEEVIL STW Wastewater Treatment Plant, Keevil, Wiltshire, England

KEEVIL STW is a wastewater treatment plant located on Sewage Works Road in Keevil, Wiltshire, England. It serves a population of approximately 3,371 people, classifying it as a small agglomeration under UK and EU regulatory frameworks. The plant is situated inland, more than 50 km from the coast. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for inland freshwater discharges from agglomerations of this size. It has a designed capacity of 8,345.00 m³/day and currently discharges 750.50 m³/day of treated effluent. The plant operates under the UK's environmental permitting regime, administered by the Environment Agency. The treated effluent is discharged into a local watercourse that ultimately drains into the Bristol Channel via the Avon and Severn river systems. The plant plays a key role in protecting the water quality of local streams and the wider Severn Estuary ecosystem, which supports diverse aquatic life and important migratory fish species.

The plant discharges into a local tributary of the River Avon (Bristol), which flows into the Severn Estuary and then the Bristol Channel. The Severn Estuary is ecologically sensitive, supporting diverse bird populations and fish species such as salmon and eels. The plant's secondary treatment helps reduce nutrient and organic loads, protecting downstream water quality.