LISS STW Wastewater Treatment Plant, East Hampshire, England

LISS STW is a wastewater treatment plant located in East Hampshire, England, serving a population of around 6,067. The facility is situated in the village of Liss, within the South Downs National Park area, and is part of the UK's wastewater infrastructure managed under the Water Industry Act 1991. However, as a small agglomeration in the UK, it is expected to provide secondary treatment in line with the Urban Waste Water Treatment (England and Wales) Regulations 1994, which transpose the EU Urban Waste Water Treatment Directive. The treated effluent from LISS STW is discharged into the local water environment, likely the River Rother or a tributary, which flows into the River Arun and eventually into the English Channel. The plant plays a role in protecting the water quality of the River Arun catchment, which supports diverse aquatic life and is important for local biodiversity.

LISS STW discharges into the River Rother catchment, which flows into the River Arun and then into the English Channel. The River Arun is a chalk stream, supporting diverse aquatic life including salmonids and invertebrates. The plant's location within the South Downs National Park adds ecological sensitivity, requiring careful management to protect water quality and habitats.