London Crawley STW - Wastewater Treatment Plant in Crawley, West Sussex, England

London Crawley STW is a municipal wastewater treatment facility located in Crawley, West Sussex, England. The plant serves a population of approximately 149,000, classifying it as a large agglomeration under the EU Urban Waste Water Treatment Directive (91/271/EEC). Its address is Beehive Ring Road, Lowfield Heath, Tinsley Green, Crawley, West Sussex, RH6 0PB. As a large agglomeration, the plant is expected to provide at least secondary treatment, with tertiary treatment required if discharging into sensitive areas. The designed capacity is 1. The plant operates under the UK's water quality regulatory framework, which transposes the EU directive's requirements for nutrient removal and environmental protection. The treated effluent is discharged into local watercourses that eventually drain into the English Channel via the River Mole or other tributaries of the Thames Basin. The plant plays a key role in protecting downstream aquatic ecosystems, including estuarine and coastal habitats, from nutrient pollution and pathogens.

The plant discharges into the River Mole catchment, part of the Thames Basin, which flows into the Thames Estuary and ultimately the North Sea. This region supports diverse aquatic life, including migratory fish species and estuarine habitats. The area is ecologically sensitive due to nutrient loading pressures from urban and agricultural runoff, making effective wastewater treatment critical for maintaining water quality.