1,887 plants indexed. Showing 1,267 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.
MOLD STW serves the town of Mold in Flintshire, Wales, treating wastewater for approximately 20,656 people. The plant operates under UK regulations aligned with the EU Urban Waste Water Treatment Directive.
GREENFIELD STW serves approximately 15,140 people in Greenfield, Wales. The plant discharges treated wastewater into the local water environment under UK regulatory frameworks.
DENBIGH STW STW serves St Asaph, Wales, treating wastewater for approximately 8,870 people. The plant operates under UK regulations and discharges into the local water environment.
Ruthin STW STW serves approximately 5,566 people in Ruthin, Denbighshire, Wales. The plant discharges treated wastewater into the local water environment under UK regulations.
Holyhead WWTW STW serves 17,680 people in Llaingoch, Wales. The plant discharges treated wastewater into the Irish Sea via local watercourses, operating under UK environmental regulations.
Bethesda STW STW serves the community of Bethesda in Gwynedd, Wales. The plant treats wastewater for approximately 5,054 people and discharges into the local water environment.
Port Talbot and Neath STW serves over 123,000 people in Wales, United Kingdom. The plant discharges into local water bodies within 50 km of the coast, supporting regional wastewater management.
LLANELLI STW serves approximately 52,847 people in Carmarthenshire, Wales, as part of the UK's wastewater infrastructure. The plant discharges into the local water environment under regulatory oversight.
Tenby and Saundersfoot STW serves 18,262 people in Cymru/Wales, United Kingdom. The plant discharges treated wastewater into the local coastal environment, supporting water quality in the region.
PEMBROKE STW serves Pembroke Dock, Wales, treating wastewater for approximately 17,713 people. The plant is located near the coast and operates under UK regulations aligned with the EU Urban Waste Water Treatment Directive.
SWANSEA STW serves approximately 169,648 people in Swansea, Wales. The plant discharges treated wastewater into the Bristol Channel, supporting local water quality standards under UK regulations.
Aberystwyth STW serves the Welsh coastal town of Aberystwyth, treating wastewater for approximately 17,858 people. The plant is located within 50 km of the coast and discharges into the local catchment.
YSTRADGYNLAIS WWTW OFF WIND ROAD STW serves Ystalyfera, Wales, treating wastewater for approximately 11,515 people. The plant operates under UK regulations and discharges into the local river system.
Pontyberem WWTW serves around 10,091 people in Pontyberem, Carmarthenshire, Wales. The plant is located within 50 km of the coast and discharges into local watercourses.
LLANNANT WWTW is a wastewater treatment plant serving Gorseinon, Swansea, Wales, UK. It serves a population of 12,450 and operates under the EU Urban Waste Water Treatment Directive.
Trebanos STW serves approximately 16,600 people in Trebanos, Wales. The plant discharges treated wastewater into the local water environment, operating under UK water quality regulations.
Colwyn Bay & Llandudno STW is a wastewater treatment plant serving approximately 80,000 people in Penrhyn-Side, Wales. It operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of this size.
Treborth Bangor STW serves Llanfairpwllgwyngyll, Wales, treating wastewater for approximately 24,190 people. The plant operates under UK regulations and discharges into the Menai Strait, which connects to the Irish Sea.
Rhyl Kinmel Bay Towyn STW serves approximately 54,652 people in Abergele, Wales. The plant operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of this scale.
Caernarfon STW STW serves approximately 12,184 people in Caernarfon, Gwynedd, Wales. The plant is located within 50 km of the coast and discharges into the Menai Strait, which connects to the Irish Sea.
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 20 plants linked to this operator.
Among the indexed plants, MOLD STW has the highest designed capacity at 1 m3/day.