1,887 plants indexed. Showing 320 matching current filters.
The UK's wastewater is treated by 11 regional water companies including Thames Water, Severn Trent, Anglian Water, Welsh Water and Scottish Water, under Ofwat regulation. UtilityRadar indexes 1887 wastewater treatment plants in United Kingdom with a combined designed capacity of 2,480,261 m³/day. The largest plant on file is ROTHERWAS STW FIR TREE LANE HFD STW, treating 76,862 m³/day.
The UK's wastewater is treated by 11 regional water companies including Thames Water, Severn Trent, Anglian Water, Welsh Water and Scottish Water, under Ofwat regulation.
UtilityRadar's directory currently lists 1,887 wastewater treatment plants across United Kingdom. Together these plants represent a combined designed capacity of approximately 2,480,261 m³/day.
By treatment level, the directory contains 598 secondary, 20 advanced, 2 primary-treatment plants. Secondary treatment (typically activated sludge with biological nutrient removal) is the most common standard.
The largest plant indexed for United Kingdom is ROTHERWAS STW FIR TREE LANE HFD STW, with a designed capacity of 76,862 m³/day.
Plant records are aggregated from publicly available regulatory data (US EPA ECHO, EU UWWTD reporting, national water authority publications), augmented by direct operator information and verified via Google Maps coordinates. Each record includes location, treatment level, capacity where known, operator and operational status. To browse plants by treatment level worldwide, see our secondary and advanced filter views, or read our guide to how sewage treatment works.
QUEENSFERRY STW serves approximately 52,000 people in Queensferry, Wales. The plant discharges treated wastewater into the Dee Estuary, a sensitive coastal environment.
FLINT STW serves approximately 23,335 people in Flint, Wales. The plant operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of this scale.
LLANASA STW serves approximately 31,500 people in Pen-y-ffordd, Flintshire, Wales. The plant is located within 50 km of the coast and discharges treated effluent into local watercourses.
Peacehaven Wastewater Treatment Works serves approximately 273,000 people in East Sussex, England. The plant discharges treated effluent into the English Channel, supporting coastal water quality.
Truro Newham STW serves approximately 28,367 people in Truro, Cornwall, England. The plant discharges treated wastewater into the local water environment near the Truro River estuary.
Blackburn STW is a major wastewater treatment plant serving South Ribble, Lancashire, England. It treats wastewater for approximately 250,700 people under the UK's regulatory framework.
Neston STW is a wastewater treatment plant serving approximately 18,075 people in Neston, England. Located near the Dee Estuary, it plays a key role in protecting the local aquatic environment.
Chester STW serves approximately 117,000 people in Chester, England. The plant operates under the UK's implementation of the EU Urban Waste Water Treatment Directive.
EIGN STW Outfall Works Road HFD STW is a wastewater treatment plant serving Bullinghope, England, UK. It handles a population equivalent of 135,931 and has a designed capacity of 1.00 (units unspecified).
OXFORD STW serves approximately 206,000 people in Oxford, England, as part of the UK's municipal wastewater infrastructure. The plant discharges treated effluent into the River Thames catchment, supporting the local aquatic environment.
Wargrave Wargrave Berks STW serves approximately 120,000 people in Wargrave, England. The plant discharges treated wastewater into the River Thames catchment, supporting local water quality.
Hertford STW serves approximately 393,000 people in East Hertfordshire, England. The plant discharges treated wastewater into local watercourses within the Thames River Basin.
London Riverside STW serves 398,000 people in Greater London, UK. The plant operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of this scale.
London Mogden STW serves 1.96 million people in Greater London, England. It discharges treated wastewater into the River Thames, which flows through London to the North Sea.
Maple Lodge Bucks STW serves approximately 499,000 people in Greater London, England. The plant operates under the UK's regulatory framework for wastewater treatment.
Maidenhead Braywick Road Maid STW serves 82,200 people in Maidenhead, England. The plant operates under the UK's Urban Waste Water Treatment Regulations, which implement the EU Urban Waste Water Treatment Directive.
LUTON STW serves approximately 158,000 people in East Hyde, England. The plant operates under the UK's implementation of the EU Urban Waste Water Treatment Directive, ensuring regulatory compliance for large agglomerations.
London Long Reach STW in Dartford, England serves approximately 858,000 people. The plant operates under the UK's implementation of the EU Urban Waste Water Treatment Directive.
Little Marlow STW serves Buckinghamshire, England, treating wastewater for approximately 164,000 people. The plant operates under UK regulations aligned with the EU Urban Waste Water Treatment Directive.
London Hogsmill Valley STW is a major wastewater treatment plant in Greater London, UK, serving approximately 391,000 people. It operates under the UK's regulatory framework derived from the EU Urban Waste Water Treatment Directive.
UtilityRadar indexes 1887 wastewater treatment plants in United Kingdom, with treatment level, capacity, operator and discharge data on each record.
Among the plants on this page, the most-referenced operator is Dŵr Cymru / Welsh Water. UtilityRadar's records show 3 plants linked to this operator.
Among the indexed plants, QUEENSFERRY STW has the highest designed capacity at 1 m3/day.