CASTLETON STW - Wastewater Treatment Plant in Rochdale, Greater Manchester, England

CASTLETON STW is a wastewater treatment plant located near the M62 motorway in Castleton, Rochdale, Greater Manchester, England. It serves a population of around 5,683 people, placing it in the small-to-medium agglomeration category. The plant is situated inland, away from coastal areas, and its operations are part of the region's municipal wastewater infrastructure. As a UK wastewater facility, CASTLETON STW operates under the Water Industry Act 1991 and is regulated by the Environment Agency. For agglomerations of this size, the Urban Waste Water Treatment Directive (transposed into UK law) typically requires secondary treatment. The regulatory framework ensures appropriate standards are met. The treated effluent from CASTLETON STW likely discharges into a local watercourse that feeds into the River Roch, which flows through Rochdale and eventually joins the River Irwell. The Irwell is a major river in Greater Manchester that drains into the Manchester Ship Canal and then the Irish Sea. The plant plays a role in protecting the water quality of these downstream environments, supporting aquatic life and recreational use.

CASTLETON STW discharges into the River Roch catchment, which flows into the River Irwell and ultimately the Manchester Ship Canal and Irish Sea. The Irwell is a key waterway in Greater Manchester, historically impacted by industrial pollution but now supporting improved biodiversity. The plant's treatment helps maintain water quality in this urbanized watershed, protecting fish populations and downstream ecosystems.