MERE STW - Wastewater Treatment Plant in Mere, Wiltshire, England

MERE STW is a wastewater treatment plant located on Rook Street in Mere, Wiltshire, England. It serves a population of 3,292 and operates under the regulatory framework of the United Kingdom, which implements the EU Urban Waste Water Treatment Directive (91/271/EEC) for secondary treatment standards. The plant provides secondary treatment, meeting the standard required for agglomerations of this size under UK regulations. The designed capacity is 8,207 m³/day, with an average daily discharge volume of 732.91 m³/day, indicating significant spare capacity for future growth. The treated effluent is discharged into local watercourses that drain into the River Stour catchment, eventually reaching the English Channel. The plant plays a key role in protecting the water quality of the surrounding rural area and downstream aquatic habitats.

MERE STW discharges into the River Stour catchment, which flows through Dorset and into the English Channel at Christchurch Harbour. The river supports diverse aquatic life, including salmonid populations, and the downstream estuary is ecologically sensitive. The plant's secondary treatment helps reduce nutrient loads and protect these habitats.