MASHAM STW - Secondary Wastewater Treatment Plant in Masham, North Yorkshire

MASHAM STW is a municipal wastewater treatment plant located in Masham, North Yorkshire, England. It serves a population of approximately 3,034 residents, classifying it as a small agglomeration under UK and EU regulatory frameworks. The plant is situated inland, away from coastal areas, and its treated effluent contributes to the local hydrological system. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. The designed capacity is 4,144 cubic meters per day, with an average discharge volume of 675.47 cubic meters per day, indicating operational headroom. As a UK facility, it operates under environmental permits issued by the Environment Agency, ensuring compliance with water quality standards. The treated wastewater from MASHAM STW is discharged into local watercourses that flow into the River Ure, a major tributary of the River Ouse in Yorkshire. The River Ure supports diverse aquatic life and is part of the Humber Estuary basin, which ultimately drains into the North Sea. The plant plays a key role in protecting water quality in this ecologically important river system.

MASHAM STW discharges into local streams that feed the River Ure, which flows through the Yorkshire Dales and joins the River Ouse near York. The River Ure supports a variety of fish species, including salmon and trout, and its catchment includes sensitive habitats. The plant's secondary treatment helps reduce organic pollutants and nutrients, safeguarding water quality downstream before the river reaches the Humber Estuary and the North Sea.