ROMSEY STW - Wastewater Treatment Plant in Test Valley, Hampshire, England

ROMSEY STW is a wastewater treatment plant located in Romsey, Test Valley, Hampshire, England. It serves a population of around 20,000, classifying it as a medium-sized agglomeration under UK regulatory frameworks. The plant is situated inland, more than 50 km from the coast, and its treated effluent is discharged into local watercourses. As a UK wastewater facility, ROMSEY 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 (91/271/EEC) requires secondary treatment as a minimum. The plant's designed capacity is 1.00 (likely in megaliters per day or similar unit), indicating it is sized to handle the local population's wastewater load. The plant's receiving water body ultimately drains into the River Test, a chalk stream of high ecological importance. The River Test flows into Southampton Water and then the English Channel. The river supports diverse aquatic life, including salmon and trout, and is a designated Site of Special Scientific Interest (SSSI) for its rich biodiversity. The plant's discharge must meet strict quality standards to protect this sensitive environment.

ROMSEY STW discharges into the River Test catchment, a classic chalk stream that flows through Hampshire to Southampton Water and the English Channel. The River Test is ecologically sensitive, supporting diverse aquatic life such as salmon, trout, and rare invertebrates. The plant's effluent quality is critical to maintaining the river's high conservation status and its role as a habitat for protected species.