Watlington Watlington Oxon STW - Secondary Wastewater Treatment in South Oxfordshire, England

Watlington Watlington Oxon STW is a wastewater treatment plant located in South Oxfordshire, Oxfordshire, England. It serves a population of approximately 2,710 people, classifying it as a small agglomeration under UK and EU regulatory frameworks. The plant is situated near the village of Watlington and operates as part of the region's municipal wastewater infrastructure. The plant provides secondary treatment, which is the standard biological treatment stage required for inland freshwater discharges under the EU Urban Waste Water Treatment Directive (91/271/EEC), as retained in UK law. With a designed capacity of 2,722 cubic meters per day and an actual discharge volume of 603.34 cubic meters per day, the plant operates well below its capacity, indicating reserve capacity for future growth or seasonal variations. The treated effluent is discharged into local watercourses that ultimately drain into the River Thames catchment, which flows through southern England to the North Sea. The plant plays a key role in protecting the local chalk streams and rivers from nutrient pollution, supporting aquatic biodiversity and downstream water quality.

The plant discharges into the River Thames basin, which drains southeast England into the North Sea via the Thames Estuary. The local watercourses include chalk streams that support diverse aquatic life, including brown trout and other sensitive species. The plant's secondary treatment helps reduce organic pollutants and nutrients, protecting downstream ecosystems from eutrophication and maintaining water quality for recreational and ecological uses.