CHOBHAM STW Wastewater Treatment Plant, Surrey Heath, England

CHOBHAM STW is a wastewater treatment plant located in Chobham, Surrey Heath, England. It serves a population of approximately 11,400, classifying it as a medium-sized agglomeration under UK and EU standards. The plant is situated inland, more than 50 km from the coast, and its operations are integral to the local sanitation infrastructure. As a UK wastewater facility, CHOBHAM STW is subject to the Urban Waste Water Treatment Regulations (transposing the EU Urban Waste Water Treatment Directive 91/271/EEC). For agglomerations of this size, secondary treatment is typically required, with additional nutrient removal if discharging to sensitive areas. The plant's treatment processes and capacity are managed to meet these regulatory standards, ensuring compliance with environmental permits issued by the Environment Agency. The treated effluent from CHOBHAM STW is discharged into local watercourses that ultimately drain into the River Thames basin. The Thames flows through southern England into the North Sea. The receiving waters support diverse aquatic life and are important for regional biodiversity. The plant plays a key role in protecting water quality in this ecologically significant catchment area.

CHOBHAM STW discharges into local streams that feed into the River Thames basin, which drains into the North Sea. The Thames estuary and its tributaries support a variety of fish, invertebrates, and bird species. The plant's operations help maintain water quality in this sensitive watershed, which is subject to eutrophication pressures from agricultural and urban runoff. Effective treatment reduces nutrient loads and protects downstream habitats.