Witney STW - West Oxfordshire Wastewater Treatment Plant, United Kingdom

Witney STW is a wastewater treatment plant located near the town of Witney in West Oxfordshire, Oxfordshire, England. It serves a population of around 44,600, making it a medium-sized agglomeration under UK and EU classifications. The plant is situated near the A40 road, close to the River Windrush. As a UK wastewater facility, Witney STW operates under the Water Industry Act 1991 and is regulated by the Environment Agency. For a population of this scale, secondary treatment is typically required, with tertiary treatment often applied in sensitive catchments. The plant is part of Thames Water's operational network, which manages wastewater services across the Thames Valley region. The treated effluent from Witney STW is discharged into the River Windrush, a tributary of the River Thames. The Windrush flows through the Cotswolds and eventually joins the Thames near Newbridge. The Thames itself drains into the North Sea via the Thames Estuary. The river supports diverse aquatic life and is an important ecological corridor in the region.

Witney STW discharges into the River Windrush, which flows into the River Thames and ultimately the North Sea. The Windrush is a chalk stream, a rare and ecologically sensitive habitat that supports species such as brown trout and water crowfoot. The plant's discharge must meet strict nutrient standards to protect the river's water quality and biodiversity.