1,887 plants indexed.
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.
Knighton STW is an advanced wastewater treatment plant serving approximately 3,021 people in Knighton, Powys, Wales. It operates under UK regulations with a designed capacity of 3,500 m³/day.
LLANIDLOES STW is a secondary treatment plant serving approximately 3,280 people in Llanidloes, Wales. It discharges 730.24 m³/day of treated wastewater, with a designed capacity of 3,500 m³/day.
PANT PLAS CERRIG STW FE is a secondary treatment plant in Llandysilio, Wales, serving a population of 2,192. It discharges 488.02 cubic meters of treated wastewater daily.
ABERGAVENNY STW is a secondary wastewater treatment plant in Glangrwyney, Wales, serving approximately 3,182 people. It discharges 708.42 cubic meters of treated effluent daily, with a designed capacity of 3,319 cubic meters.
USK STW Graig Olway Farm Llangview STW is a secondary treatment plant serving 2,877 people in Llanllowell, Wales. It discharges 640.52 m³/day of treated wastewater near the coast.
RAGLAN STW CHEPSTOW ROAD RAGLAN STW is a closed secondary treatment plant in Raglan, Wales, serving 1,210 people. It discharged 269.39 m³/day with a designed capacity of 1,300 m³/day.
Creigiau Sewage Treatment Works (STW) serves the Creigiau area of Cardiff, Wales, treating wastewater for approximately 2,500 residents with secondary treatment before discharge.
DROPE STW Westbury Homes Glamorgan STW is a secondary treatment plant in Cardiff, Wales, serving approximately 2,011 people. It discharges treated wastewater near the coast, operating under UK regulations.
RHYDLAFAR ST STW is a secondary wastewater treatment plant serving 2,840 people in Cardiff, Wales, United Kingdom. It discharges 632.28 cubic meters of treated effluent daily.
ST ASAPH STW in St Asaph, Wales, is an advanced treatment plant serving 4,239 people. It discharges 943.75 m³/day of treated wastewater, with a designed capacity of 4,536 m³/day, located within 10 km of the coast.
KIRKBY MALZEARD STW is a secondary treatment plant serving approximately 2,100 people in Kirkby Malzeard, North Yorkshire, England. It discharges treated wastewater into the local water environment.
Wheldrake STW is a secondary treatment plant serving 2,239 people in Wheldrake, England. It discharges 498.48 cubic meters of treated wastewater daily, operating under UK regulations.
HMP Lindholme and Moorland is a secondary wastewater treatment plant serving a population of 2,361 in Doncaster, England. It discharges treated effluent into local watercourses within the Humber River Basin.
Swinderby STW is a secondary treatment plant in North Kesteven, England, serving a population of 2,059. It discharges treated wastewater into the local water environment.
Yeoford STW is a secondary treatment plant in Mid Devon, England, serving a population of 2,071. It discharges 461.08 cubic meters of treated wastewater daily into the local watercourse.
SOUTH MILTON STW is a secondary treatment plant in South Hams, England, serving 1,866 people. It discharges 415.44 m³/day of treated wastewater and is located within 10 km of the coast.
NORTH TAWTON STW is a secondary wastewater treatment plant in West Devon, England, serving approximately 2,111 people. It discharges treated effluent into local watercourses within the Devon and Torbay catchment.
Newton Ferrers STW is a secondary treatment plant in South Hams, Devon, England, serving a population of 2,222. It discharges treated wastewater near the coast, operating under UK environmental regulations.
FENITON STW is a secondary treatment plant in East Devon, England, serving 2,103 people. It discharges 468.20 m³/day of treated wastewater near the coast.
BRADNINCH STW is a secondary wastewater treatment plant serving approximately 2,093 people in Bradninch, Mid Devon, England. It discharges treated effluent into local watercourses within the Devon catchment.
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 10 plants linked to this operator.
Among the indexed plants, ST ASAPH STW ST ASAPH STW has the highest designed capacity at 4,536 m3/day.