ANDOVER STW Wastewater Treatment Plant, Test Valley, England

ANDOVER STW is a wastewater treatment plant located in Test Valley, Hampshire, England, United Kingdom. The plant serves a population of approximately 63,351 people, placing it in the medium agglomeration category under EU regulations. It is situated inland, away from the coast, and its operations are governed by the UK's environmental regulatory framework. As a plant serving over 50,000 people, ANDOVER STW is expected to meet secondary treatment standards under the EU Urban Waste Water Treatment Directive (91/271/EEC), which has been retained in UK law. The plant likely incorporates biological treatment stages to comply with discharge standards. The treated effluent from ANDOVER STW is discharged into local watercourses that ultimately drain into the River Test, a chalk stream known for its high ecological value. The River Test flows into the English Channel via Southampton Water. The plant plays a crucial role in protecting the water quality of this sensitive river system, which supports diverse aquatic life and is important for conservation.

ANDOVER STW discharges into the River Test catchment, a classic chalk stream that flows through Hampshire to Southampton Water and then the English Channel. The River Test is ecologically sensitive, supporting diverse aquatic life including salmonids and rare invertebrates. The plant's operations help maintain water quality in this important river system, which is a designated Site of Special Scientific Interest (SSSI) for its biodiversity.