Chesham Bucks STW - Wastewater Treatment Plant in Chesham, England

Chesham Bucks STW is a municipal wastewater treatment plant located in Chesham, Buckinghamshire, England. It serves a population of around 36,000, classifying it as a medium-sized agglomeration under UK and EU standards. The plant is situated inland, away from coastal areas, and its operations are integral to the local sanitation infrastructure. As a UK wastewater facility, Chesham Bucks STW is regulated under the Urban Waste Water Treatment Regulations, which transpose 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 into sensitive areas. The plant's treatment processes are designed to meet these standards, ensuring compliance with environmental permits issued by the Environment Agency. The treated effluent from Chesham Bucks STW is discharged into the River Chess, a chalk stream that flows through the Chiltern Hills Area of Outstanding Natural Beauty. The River Chess is a tributary of the River Colne, which eventually joins the River Thames. This watercourse supports diverse aquatic life, including brown trout and water voles, and is ecologically sensitive due to its chalk stream characteristics. The plant's discharge must be carefully managed to protect this fragile ecosystem.

Chesham Bucks STW discharges into the River Chess, a chalk stream renowned for its clear, mineral-rich waters and biodiversity. The River Chess flows into the River Colne, which joins the River Thames, ultimately reaching the North Sea. The Chess supports species such as brown trout, grayling, and the white-clawed crayfish. Its chalk stream habitat is rare and sensitive to nutrient pollution, making the plant's treatment performance critical for downstream ecological health.