Hartley Wintney STW: Wastewater Treatment Plant in Hart, Hampshire, United Kingdom

Hartley Wintney STW is a wastewater treatment plant located in Hartley Wintney, Hampshire, England, serving a population of approximately 20,700. The facility is part of the UK's municipal wastewater infrastructure, managed under the Water Industry Act 1991 and regulated by the Environment Agency. As a medium-sized agglomeration, the plant is expected to provide secondary treatment under the Urban Waste Water Treatment Directive (91/271/EEC), which is transposed into UK law. The plant's scale aligns with typical UK standards for such communities. The treated effluent is discharged into local watercourses that drain into the River Loddon, a tributary of the River Thames. The Thames eventually flows into the North Sea via the Thames Estuary. The plant plays a key role in protecting the local chalk stream ecosystems, which are sensitive to nutrient pollution.

The plant discharges into the River Loddon catchment, which feeds into the River Thames and ultimately the North Sea. The local chalk streams support diverse aquatic life, including salmonids and invertebrates, and are sensitive to nutrient enrichment. The plant's treatment helps maintain water quality in this ecologically important river system.