1,887 plants indexed. Showing 1,857 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.
CRYNANT STW STW serves approximately 5,193 people in Crynant, Neath Port Talbot, Wales. The plant operates under UK wastewater regulations and discharges treated effluent into the local river system.
CWMGWRCH STW STW is a wastewater treatment plant serving Cwmgwrach, Wales, UK. It treats wastewater for approximately 5,366 people and operates under UK environmental regulations.
Llandrindod Wells STW Park Lane STW is a municipal wastewater treatment plant in Llandrindod, Wales, serving approximately 6,246 people. It operates under UK regulations and discharges into local watercourses within the River Wye catchment.
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.
WELSHPOOL STW serves the town of Welshpool in Powys, Wales, treating wastewater for approximately 11,164 people. The plant discharges into the River Severn catchment, supporting local water quality.
NEWTOWN STW serves Abermule, Powys, Wales, treating wastewater for approximately 15,954 people. The plant operates under the UK's implementation of the EU Urban Waste Water Treatment Directive.
BRYNMAWR STW BLACKROCK BRYNMAWR STW serves the Darrenfelen area in Blaenau Gwent, Wales, treating wastewater for a population of approximately 5,578 under UK regulations.
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.
BRECON STW serves Brecon, Powys, Wales, treating wastewater for approximately 8,500 residents. The plant discharges into the River Usk catchment, supporting local water quality in the Brecon Beacons region.
LLANFOIST SEWAGE TREATMENT WORKS ME STW serves Abergavenny, Wales, treating wastewater for approximately 15,368 people. The plant operates under UK regulations and discharges into the local water environment.
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.
CYNON VALLEY STW serves Pontypridd, Wales, treating wastewater for approximately 64,156 people. The plant operates under UK regulations aligned with the EU Urban Waste Water Treatment Directive.
Aberbaiden STW Behind Hop Yard Farm STW serves Govilon, Monmouthshire, Wales. The plant treats wastewater for approximately 5,359 people under UK and EU regulatory frameworks.
SOUTH ELY VALLEY STW serves approximately 43,596 people in the Vale of Glamorgan, Wales. The plant operates under the EU Urban Waste Water Treatment Directive, ensuring secondary treatment for this medium-sized agglomeration.
Cowbridge STW serves the town of Cowbridge in the Vale of Glamorgan, Wales, treating wastewater for approximately 6,545 people. The plant is located near the coast and discharges into local watercourses.
North Ely Valley STW serves Llantrisant, Wales, treating wastewater for over 13,000 people. The plant discharges into local watercourses within the Severn Estuary catchment.
Merthyr Tydfil STW is a municipal wastewater treatment plant serving Pontypridd, Wales, United Kingdom. It serves a population of approximately 70,624 and operates under UK environmental regulations.
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, RHIWSAESON STW RHIWSAESON LLANTRI STW has the highest designed capacity at 22,669 m3/day.