Wastewater treatment plants operated by Dŵr Cymru / Welsh Water

120 plants indexed — showing the largest 100 below.

Dŵr Cymru (Welsh Water) is the not-for-profit water and sewerage company serving most of Wales and parts of western England.

Total designed capacity202,888 m³/day
Combined population served2,654,998
CountriesUnited Kingdom

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Plants operated by Dŵr Cymru / Welsh Water

RHIWSAESON STW RHIWSAESON LLANTRI STW
Groes-faen, Cymru / Wales, United Kingdom
Secondary 22,669 m³/day
LLANFAES STW
Llanfaes, Cymru / Wales, United Kingdom
Secondary 10,613 m³/day
LAMPETER STW STW
Lampeter, Cymru / Wales, United Kingdom
Secondary 8,678 m³/day
B_AU FES STW STW
Blaenau Ffestiniog, Cymru / Wales, United Kingdom
Secondary 5,195 m³/day
MOSTYN STW
Mostyn, Cymru / Wales, United Kingdom
Secondary 4,620 m³/day
ST ASAPH STW ST ASAPH STW
St Asaph, Cymru / Wales, United Kingdom
Advanced 4,536 m³/day
KIDWELLY WASTEWATER TREATMENT WORKS STW
Kidwelly, Cymru / Wales, United Kingdom
Secondary 4,420 m³/day
NEYLAND WWTW NEYLAND PEMBROKESHIRE STW
Neyland, Cymru / Wales, United Kingdom
Secondary 4,321 m³/day
LLANLLYFNI C STW
Clynnog, Cymru / Wales, United Kingdom
Secondary 4,231 m³/day
LLANRWST STW LLLANWRST CONWY STW
Llanrwst, Cymru / Wales, United Kingdom
Secondary 4,072 m³/day
DOLGELLAU ST STW
Llanelltyd, Cymru / Wales, United Kingdom
Secondary 3,918 m³/day
LLANFAIRFECN STW
Abergwyngregyn, Cymru / Wales, United Kingdom
Secondary 3,783 m³/day
NARBERTH WES STW
Canaston Bridge, Cymru / Wales, United Kingdom
Secondary 3,668 m³/day
LLANIDLOES STW
Llanidloes, Cymru / Wales, United Kingdom
Secondary 3,500 m³/day
KNIGHTON STW
Knighton, Cymru / Wales, United Kingdom
Advanced 3,500 m³/day
FFAIRFACH WWTW FFAIRFACH CARMS STW
Llandeilo, Cymru / Wales, United Kingdom
Secondary 3,472 m³/day
LLANRUG WWTW STW
Llanrug, Cymru / Wales, United Kingdom
Secondary 3,452 m³/day
LLANGOLLEN STW
Llangollen, Cymru / Wales, United Kingdom
Secondary 3,436 m³/day
L_FR PG WWTW STW
Llanfairpwllgwyngyll, Cymru / Wales, United Kingdom
Secondary 3,399 m³/day
BUILTH WELLS STW STW
Llanelwedd, Cymru / Wales, United Kingdom
Secondary 3,381 m³/day
CORWEN WWTW STW
Corwen, Cymru / Wales, United Kingdom
Secondary 3,375 m³/day
ABERGAVENNY STW
Glangrwyney, Cymru / Wales, United Kingdom
Secondary 3,319 m³/day
DYFFRYN ARDUDWY STW
Llanenddwyn, Cymru / Wales, United Kingdom
Secondary 3,299 m³/day
CROSSHANDS S STW
Cross Hands, Cymru / Wales, United Kingdom
Advanced 3,261 m³/day
TALGARTH STW BRONLLYS ROAD TALGARTH STW
Bronllys, Cymru / Wales, United Kingdom
Secondary 3,081 m³/day
RESOLVEN STW STORM TANKS NEATH STW
Melincourt, Cymru / Wales, United Kingdom
Secondary 2,988 m³/day
PONTYATES WWTW PONTYATES LLANELLI STW
Pont-iets, Cymru / Wales, United Kingdom
Secondary 2,955 m³/day
TRIMSARAN WWTW SPUDDER BRIDGE RD STW
Sir Gaerfyrddin / Carmarthenshire, Cymru / Wales, United Kingdom
Secondary 2,942 m³/day
MACHYNLLETH STW STW
Gwynedd, Cymru / Wales, United Kingdom
Secondary 2,916 m³/day
GAERWEN STW
Ynys Môn / Isle of Anglesey, Cymru / Wales, United Kingdom
Secondary 2,885 m³/day
USK STW GRAIG OLWAY FARM LLANGVIEW STW
Llanllowell, Cymru / Wales, United Kingdom
Secondary 2,877 m³/day
RHYDLAFAR ST STW
Cardiff, Cymru / Wales, United Kingdom
Secondary 2,840 m³/day
ST CLEARS WWTW STW
St Clears, Cymru / Wales, United Kingdom
Secondary 2,827 m³/day
BORTH STW
Borth, Cymru / Wales, United Kingdom
Secondary 2,678 m³/day
RHAYADER STW RHAYADER STW
Rhayader, Cymru / Wales, United Kingdom
Secondary 2,670 m³/day
LLANBEDR STW
Llanbedr, Cymru / Wales, United Kingdom
Secondary 2,660 m³/day
DYSERTH STW STW
St Asaph, Cymru / Wales, United Kingdom
Secondary 2,657 m³/day
PRESTEIGNE STW CLATTERBROOM STW
Presteigne, Cymru / Wales, United Kingdom
Secondary 2,589 m³/day
BALA WWTW STW
Llangywer, Cymru / Wales, United Kingdom
Secondary 2,587 m³/day
TREGARTH STW
Bethesda, Cymru / Wales, United Kingdom
Secondary 2,554 m³/day
DREFACH_VELI STW
Waungilwen, Cymru / Wales, United Kingdom
Secondary 2,519 m³/day
CREIGIAU SEW STW
Cardiff, Cymru / Wales, United Kingdom
Secondary 2,482 m³/day
ADPAR WWTW ADPAR CEREDIGION STW
Newcastle Emlyn, Cymru / Wales, United Kingdom
Secondary 2,401 m³/day
LANGDON WWTW BEGELLY PEMBROKESHIRE STW
Jeffreyston, Cymru / Wales, United Kingdom
Secondary 2,396 m³/day
LLANDOVERY WASTEWATER TREATMENT STW
Llandovery, Cymru / Wales, United Kingdom
Secondary 2,343 m³/day
LLANBERIS STW
Llanberis, Cymru / Wales, United Kingdom
Advanced 2,341 m³/day
PEMBREY WASTEWATER TREATMENT WORKS STW
Pembrey, Cymru / Wales, United Kingdom
Secondary 2,262 m³/day
PENRHYNDEUDRAETH STW
Penrhyndeudraeth, Cymru / Wales, United Kingdom
Secondary 2,198 m³/day
PANT PLAS CERRIG STW FE
Llandysilio, Cymru / Wales, United Kingdom
Secondary 2,192 m³/day
BLUESTONE LEISURE CANASTON
Robeston Wathen, Cymru / Wales, United Kingdom
Advanced 2,096 m³/day
LLANMADOC WWTW BRITANIA INN LLANMAD STW
Llanmadoc, Cymru / Wales, United Kingdom
Secondary 2,034 m³/day
LLANDYSUL WWTW LLANDYSUL CEREDIGION STW
Pont-Tyweli, Cymru / Wales, United Kingdom
Secondary 2,030 m³/day
DROPE STW WESTBURY HOMES GLAMORGAN STW
Cardiff, Cymru / Wales, United Kingdom
Secondary 2,011 m³/day
LLANYBYDDER WWTW CEREDIGION STW
Llanybydder, Cymru / Wales, United Kingdom
Secondary 1,991 m³/day
WHITLAND WWTW WHITLAND CARMS STW
Whitland, Cymru / Wales, United Kingdom
Secondary 1,925 m³/day
Donaghmore
Llanrwst, Cymru / Wales, United Kingdom
Advanced 1,500 m³/day
RAGLAN STW CHEPSTOW ROAD RAGLAN STW
Raglan, Cymru / Wales, United Kingdom
Secondary 1,300 m³/day
LLANASA STW
Pen-y-ffordd, Cymru / Wales, United Kingdom
1 m³/day
FLINT STW
Flint, Cymru / Wales, United Kingdom
1 m³/day
HOPE STW STW
Caergwrle, Cymru / Wales, United Kingdom
1 m³/day
DEE STW
Worthenbury, Cymru / Wales, United Kingdom
1 m³/day
LLANDYRNOG S STW
Llandyrnog, Cymru / Wales, United Kingdom
1 m³/day
BUCKLEY STW
Buckley, Cymru / Wales, United Kingdom
1 m³/day
QUEENSFERRY STW
Queensferry, Cymru / Wales, United Kingdom
1 m³/day
RHUDDLAN WWTW FINAL STW
Rhyl, Cymru / Wales, United Kingdom
1 m³/day
CEFN MAWR STW HEOL BERWYN CEFN MAWR STW
Cefn Mawr, Cymru / Wales, United Kingdom
1 m³/day
MERTHYR TYDFIL STW
Pontypridd, Cymru / Wales, United Kingdom
1 m³/day
NORTH ELY VALLEY STW
Llantrisant, Cymru / Wales, United Kingdom
1 m³/day
COWBRIDGE STW COWBRIDGE VALE OF GLA STW
Cowbridge, Cymru / Wales, United Kingdom
1 m³/day
SOUTH ELY VALLEY STW
Vale of Glamorgan, Cymru / Wales, United Kingdom
1 m³/day
ABERBAIDEN STW BEHIND HOP YARD FARM STW
Govilon, Cymru / Wales, United Kingdom
1 m³/day
CYNON VALLEY STW
Pontypridd, Cymru / Wales, United Kingdom
1 m³/day
LLANFOIST SEWAGE TREATMENT WORKS ME STW
Abergavenny, Cymru / Wales, United Kingdom
1 m³/day
PONTHIR STW
Newport, Cymru / Wales, United Kingdom
1 m³/day
NEWPORT STW
Newport, Cymru / Wales, United Kingdom
1 m³/day
BRYNMAWR STW BLACKROCK BRYNMAWR STW
Darrenfelen, Cymru / Wales, United Kingdom
1 m³/day
CARDIFF WEST AND BARRY COG MOORS
Lavernock, Cymru / Wales, United Kingdom
1 m³/day
CARDIFF STW
Cardiff, Cymru / Wales, United Kingdom
1 m³/day
MONMOUTH STW STW
Monmouth, Cymru / Wales, United Kingdom
1 m³/day
CWMGWRCH STW STW
Cwmgwrach, Cymru / Wales, United Kingdom
1 m³/day
CRYNANT STW STW
Neath Port Talbot, Cymru / Wales, United Kingdom
1 m³/day
BRIDGEND STW
Ogmore, Cymru / Wales, United Kingdom
1 m³/day
GOWERTON STW
Sir Gaerfyrddin / Carmarthenshire, Cymru / Wales, United Kingdom
1 m³/day
LLANGENNECH WASTE WATER TREATMENT STW
Llangennech, Cymru / Wales, United Kingdom
1 m³/day
AMMANFORD STW
Swansea, Cymru / Wales, United Kingdom
1 m³/day
MILFORD HAVEN STW
Milford Haven, Cymru / Wales, United Kingdom
1 m³/day
CARMARTHEN STW
Carmarthen, Cymru / Wales, United Kingdom
1 m³/day
CARDIGAN STW
Aberteifi / Cardigan, Cymru / Wales, United Kingdom
1 m³/day
HAVERFORD WEST STW
Haverfordwest, Cymru / Wales, United Kingdom
1 m³/day
MAESTEG STW
Llangynwyd, Cymru / Wales, United Kingdom
1 m³/day
LLANGEFNI STW
Pentre Berw, Cymru / Wales, United Kingdom
1 m³/day
LLANFAGLAN STW
Llanfaglan, Cymru / Wales, United Kingdom
1 m³/day
CAERNARFON STW STW
Caernarfon, Cymru / Wales, United Kingdom
1 m³/day
RHYL KINMEL BAY TOWYN STW
Abergele, Cymru / Wales, United Kingdom
1 m³/day
TREBORTH BANGOR STW
Llanfairpwllgwyngyll, Cymru / Wales, United Kingdom
1 m³/day
COLWYN BAY _ LLANDUDNO STW
Penrhyn-Side, Cymru / Wales, United Kingdom
1 m³/day
TREBANOS STW PHEASANT RD TREBANOS STW
Trebanos, Cymru / Wales, United Kingdom
1 m³/day
LLANNANT WWTW LLANNANT ROAD SWANSEA STW
Gorseinon, Cymru / Wales, United Kingdom
1 m³/day
PONTYBEREM WWTW PONTYBEREM CARMS STW
Pontyberem, Cymru / Wales, United Kingdom
1 m³/day
YSTRADGYNLAIS WWTW OFF WIND ROAD STW
Ystalyfera, Cymru / Wales, United Kingdom
1 m³/day
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