MERSTHAM STW - Reigate and Banstead Wastewater Treatment Plant, England

MERSTHAM STW is a wastewater treatment plant located in Merstham, Reigate and Banstead, Surrey, England. It serves a population of approximately 8,330 people, classifying it as a small to medium agglomeration under UK water industry standards. The plant is situated inland, more than 50 km from the coast, and its operations are part of the region's municipal wastewater infrastructure. As a UK-based facility, MERSTHAM STW operates under the Urban Waste Water Treatment (England and Wales) Regulations, which transpose the EU Urban Waste Water Treatment Directive. The designed capacity is 1.00, indicating the plant's intended throughput. The treated effluent from MERSTHAM STW is discharged into local watercourses that ultimately drain into the River Mole, a tributary of the River Thames. The Thames then flows into the North Sea via the Thames Estuary. The plant plays a role in protecting the water quality of these downstream environments, supporting aquatic life and recreational uses.

The plant discharges into local streams that feed the River Mole, which joins the River Thames near London. The Thames Estuary is an ecologically important area supporting diverse fish, bird, and invertebrate populations. The plant's operations help maintain water quality in this sensitive downstream ecosystem, which is subject to pressures from urban runoff and industrial activity.