Steyning STW Wastewater Treatment Plant, West Sussex, England

Steyning STW is a wastewater treatment plant located on Kings Barn Lane in Steyning, West Sussex, England. It serves a population of around 10,183 residents in this historic market town within the Horsham district. The plant is part of the UK's wastewater infrastructure, managed under the Water Industry Act 1991 and regulated by the Environment Agency. As a plant serving a medium-sized agglomeration, Steyning STW is expected to meet secondary treatment standards under the Urban Waste Water Treatment (England and Wales) Regulations 1994, which transpose the EU Urban Waste Water Treatment Directive. The plant's designed capacity is 1.00 million litres per day, indicating its scale for the local community. Treatment processes typically include primary settlement and biological treatment, though specific details are not publicly available. The treated effluent from Steyning STW is discharged into the local water environment, likely into the River Adur or a tributary, which flows southward to the English Channel at Shoreham-by-Sea. This river supports diverse aquatic life and is an important ecological corridor in the South Downs National Park area. The plant's operation helps protect the water quality of the Adur catchment and the coastal waters of the Channel.

Steyning STW discharges into the River Adur catchment, which flows through the South Downs to the English Channel. The river supports diverse aquatic species and is a key habitat for migratory fish. The plant's treatment helps maintain water quality in this ecologically sensitive area, which is part of the wider Sussex marine environment.