1,887 plants indexed. Showing 476 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.
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.
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.
LLANFAGLAN STW is a wastewater treatment plant serving approximately 5,252 people in Llanfaglan, Gwynedd, Wales. It operates under UK regulations and discharges into local watercourses within the coastal region.
LLANGEFNI STW serves Pentre Berw on the Isle of Anglesey, Wales, treating wastewater for approximately 17,208 people. The plant operates under UK and EU regulations for secondary treatment.
Haverford West STW serves 17,556 people in Pembrokeshire, Wales. The plant operates under the EU Urban Waste Water Treatment Directive, which requires secondary treatment for agglomerations of this size.
Milford Haven STW serves approximately 14,300 people in Milford Haven, Pembrokeshire, Wales. The plant discharges treated wastewater into the Milford Haven Waterway, a ria that flows into the Celtic Sea.
BRIDGEND STW serves approximately 150,000 people in Ogmore, Wales, as part of the United Kingdom's wastewater infrastructure. The plant operates under UK regulations implementing the EU Urban Waste Water Treatment Directive.
MONMOUTH STW STW serves approximately 11,258 people in Monmouth, Wales. The plant discharges treated wastewater into the River Wye, a designated Site of Special Scientific Interest, and operates under UK environmental regulations.
Cardiff STW serves over 840,000 people in Cardiff, Wales, as a major wastewater treatment facility. The plant discharges treated effluent into the Bristol Channel, supporting local water quality and marine ecosystem health.
Cardiff West and Barry Cog Moors wastewater treatment plant serves approximately 194,000 people near Lavernock, Wales. The facility operates under UK regulations implementing the EU Urban Waste Water Treatment Directive.
NEWPORT STW serves approximately 275,000 people in Newport, Wales, as part of the UK's wastewater infrastructure. The plant discharges into the Severn Estuary, a major tidal water body with significant ecological importance.
PONTHIR STW is a wastewater treatment plant serving approximately 93,987 people in Newport, Wales, United Kingdom. It operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of this scale.
RHIWSAESON STW is a secondary treatment plant serving Groes-faen, Wales, UK. It has a designed capacity of 22,669 m³/day and is located near the coast, discharging into local watercourses.
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.
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 19 plants linked to this operator.
Among the indexed plants, RHIWSAESON STW RHIWSAESON LLANTRI STW has the highest designed capacity at 22,669 m3/day.