Cholsey Cholsey Wallingford STW - Wastewater Treatment in South Oxfordshire, England

Cholsey Cholsey Wallingford STW is a wastewater treatment plant located in Cholsey Village, South Oxfordshire, England. It serves a population of around 16,200 people, classifying it as a medium-sized agglomeration under UK regulations. The plant is situated near the River Thames, a major watercourse in southern England. As a UK wastewater facility, the plant operates under the Urban Waste Water Treatment (England and Wales) Regulations 1994, which transpose the EU Urban Waste Water Treatment Directive. For a population of this scale, secondary treatment is typically required. Regulatory standards ensure compliance with environmental quality objectives. The treated effluent is discharged into the River Thames catchment, which flows through Oxfordshire and eventually into the North Sea via the Thames Estuary. The plant plays a key role in protecting the Thames from nutrient pollution and safeguarding aquatic habitats in this ecologically important river system.

The plant discharges into the River Thames catchment, which drains through Oxfordshire and London before reaching the North Sea. The Thames supports diverse aquatic life, including fish species such as salmon and eels, and is an important migratory corridor. Protecting water quality in this catchment is critical for downstream ecosystems and recreational uses.