PETWORTH SOUTH STW - Secondary Wastewater Treatment in Duncton, Chichester

PETWORTH SOUTH STW is a municipal wastewater treatment plant located in Duncton, near Chichester, West Sussex, England. The facility serves a population of approximately 2,527 and operates under the regulatory framework of the United Kingdom, which implements the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this scale. The plant provides secondary treatment, a standard requirement under the directive for inland freshwater discharges. With a designed capacity of 2,527 population equivalents and a daily discharge volume of 562.60 cubic meters, the facility is sized to match the local population. The UK Environment Agency oversees permitting and compliance for such plants. The treated effluent is discharged into local watercourses that drain into the River Rother and eventually the English Channel. The surrounding area includes the South Downs National Park, an ecologically sensitive region supporting chalk streams and diverse aquatic habitats. Proper treatment helps protect downstream water quality and biodiversity.

The plant discharges into local streams that feed the River Rother, which flows into the English Channel near Rye Harbour. The catchment area includes the South Downs, a region of chalk geology supporting rare species and groundwater-dependent ecosystems. Effective secondary treatment is critical to prevent nutrient enrichment and protect the sensitive coastal and estuarine environments downstream.