Haslemere STW Wastewater Treatment Plant, Waverley, England

Haslemere STW is a wastewater treatment plant located in Woolmer Hill, near Haslemere, Surrey, England, serving the Waverley area. The plant has a designed capacity of 1.00 (units unspecified) and serves a population equivalent of around 14,000, classifying it as a medium-sized agglomeration under UK and EU frameworks. As a UK wastewater facility, Haslemere STW operates under the Water Industry Act 1991 and is subject to the Urban Waste Water Treatment Regulations 1994, which transpose the EU Urban Waste Water Treatment Directive (91/271/EEC). For a plant serving approximately 14,000 people, secondary treatment is typically required, with tertiary treatment if discharging into sensitive areas. The treated effluent from Haslemere STW is discharged into local watercourses that drain into the River Wey and ultimately the River Thames, which flows into the North Sea. The plant plays a key role in protecting the water quality of the Wey catchment, which supports diverse aquatic life and is used for recreation.

Haslemere STW discharges into the River Wey catchment, part of the Thames Basin. The River Wey flows north to join the Thames near Weybridge, then to the North Sea. The catchment supports chalk stream habitats and is important for biodiversity, including species like brown trout and kingfisher. The plant's operation helps maintain water quality in this ecologically sensitive area.