Here are all the reported sewage overflow totals for Dwyfor Meirionnydd in 2022. Sometimes sewage can be being dumped for months at a time.
Company | Waterway | Site | Sewage Dumps | Duration (Hours) | Reporting % |
---|---|---|---|---|---|
Dwr Cymru Welsh Water | River Erch | Abererch WwTW Storm Overflow | 224 | 4,298 | 99.9 |
Dwr Cymru Welsh Water | River Rhyd Hir | CSO at Llithfaen WwTW | 144 | 2,672 | 100 |
Dwr Cymru Welsh Water | River Glaslyn | Settled Storm at Beddgelert Waste Water Treatment | 157 | 2,596 | 100 |
Dwr Cymru Welsh Water | River Erch | CSO at Four Crosses STW | 238 | 2,491 | 100 |
Dwr Cymru Welsh Water | River Goedol | BLAENAU FFESTINIOG WWTW (Settled STORM) | 146 | 2,482 | 100 |
Dwr Cymru Welsh Water | River Llyfni | Settled Storm Sewage at Llanllyfni WwTW | 175 | 2,077 | 84.8 |
Dwr Cymru Welsh Water | Tremadog Bay | Criccieth STW CSO to Settled Storm Sewage Tanks | 140 | 2,034 | 99.8 |
Dwr Cymru Welsh Water | Nant Brisgyll | CSO at Llan Ffestiniog Sewage Treatment Works | 271 | 2,010 | 99.6 |
Dwr Cymru Welsh Water | Coastal Waters | FAIRBOURNE WWTW STORM TANKS | 91 | 1,657 | 100 |
Dwr Cymru Welsh Water | Tyddyn Drain To Coastal Waters | TREFOR WWTW | 127 | 1,514 | 49.55 |
Dwr Cymru Welsh Water | River Glaslyn | CSO at Porthmadog Borth-Y-Gest SPS | 103 | 1,316 | 99.8 |
Dwr Cymru Welsh Water | Mawddach | Llanelltyd PS CSO | 85 | 1,283 | 79.4 |
Dwr Cymru Welsh Water | Cwmllechen | BONTDDU STW | 106 | 1,202 | 100 |
Dwr Cymru Welsh Water | River Wen | CSO at Chwilog STW | 96 | 1,187 | 100 |
Dwr Cymru Welsh Water | Coastal Waters Of Cardigan Bay | TYWYN STW MORFA GWYLLT TYWYN | 81 | 1,037 | 99.8 |
Dwr Cymru Welsh Water | River Rhyd Hir | LLANNOR STW (SETTLED STORM) | 120 | 950 | 100 |
Dwr Cymru Welsh Water | River Geirch | NEFYN WWTW | 103 | 919 | 100 |
Dwr Cymru Welsh Water | River Cedron | PENTREFELIN STW | 97 | 870 | 99.9 |
Dwr Cymru Welsh Water | River Tafarn Helyg | GELLILYDAN STW (SETTLED STORM) | 110 | 801 | 99.6 |
Dwr Cymru Welsh Water | River Llyfni | Pontllyfni STW-CSO Pontllyfni | 53 | 725 | 100 |
Dwr Cymru Welsh Water | River Dee | Bala WwTW Storm Tank | 89 | 691 | 99.4 |
Dwr Cymru Welsh Water | Nant Brisgyll | CSO at Llanffestiniog STW | 93 | 659 | 99.6 |
Dwr Cymru Welsh Water | Estuarial Waters Of River Dwyryd | MAENTWROG WWTW | 91 | 657 | 100 |
Dwr Cymru Welsh Water | Dulas | LOWER CORRIS STW | 53 | 641 | 100 |
Dwr Cymru Welsh Water | Unnamed Stream | MYNYTHO STW - STORM OVERFLOW | 100 | 640 | 91.6 |
Dwr Cymru Welsh Water | River Dwyryd | Penrhyndeudraeth CSO | 88 | 616 | 99.9 |
Dwr Cymru Welsh Water | River Rhyd Hir | Settled Storm Overflow at Efailnewydd Wastewater Treatment Works | 173 | 595 | 99.9 |
Dwr Cymru Welsh Water | River Ceunant Sych | CSO at Land Off A496 Manod Blaenau Ffesti | 101 | 554 | 97.7 |
Dwr Cymru Welsh Water | River Goedol | CSO at Land Off Pencefn Road Tanygrisiau | 91 | 531 | 98.5 |
Dwr Cymru Welsh Water | River Dyfrdwy | The Eagles CSO, Llanwchllyn | 52 | 514 | 99.2 |
Dwr Cymru Welsh Water | River Bowydd | CWM BOWYDD SSO BLAENAU FFESTINIOG | 90 | 496 | 100 |
Dwr Cymru Welsh Water | River Barlwyd | LAND OPP GLANLLYN NR OAKLEY SQUARE CSO | 97 | 428 | 100 |
Dwr Cymru Welsh Water | Llyfni | PONTLLYFNI PS | 77 | 425 | 100 |
Dwr Cymru Welsh Water | Caernarfon Bay | NEFYN PUMPING STATION | 99 | 421 | 100 |
Dwr Cymru Welsh Water | River Artro | LLANBEDR TERMINAL PS (STORM) | 47 | 386 | 74 |
Dwr Cymru Welsh Water | Cardigan Bay | BARMOUTH WWTW LONG SEA OUTFALL | 175 | 369 | 99.8 |
Dwr Cymru Welsh Water | River Glaslyn | CSO at Beddgelert East Bank Afon Glaslyn | 62 | 358 | 75.8 |
Dwr Cymru Welsh Water | River Mawddach | Penmaenpool PS | 56 | 356 | 74.8 |
Dwr Cymru Welsh Water | Cyt Bach Surface Watercourse | SNOWDON STREET PS | 103 | 348 | 99.6 |
Dwr Cymru Welsh Water | Tremadog Bay | MORFA BYCHAN WWTW | 71 | 321 | 98.7 |
Dwr Cymru Welsh Water | Unnamed Stream | Clynnog Fawr CSO at PS | 91 | 282 | 96 |
Dwr Cymru Welsh Water | Tremadog Bay | CRICCIETH WEST PS , , | 33 | 263 | 99.4 |
Dwr Cymru Welsh Water | River Blaen-Y-Cae | BRYNCIR STW | 81 | 262 | 99.9 |
Dwr Cymru Welsh Water | River Dwyfor | CSO at Garndolbenmaen STW | 21 | 237 | 100 |
Dwr Cymru Welsh Water | Dwyryd | PENRHYNDEUDRAETH OUTFALL-SCREE | 28 | 228 | 100 |
Dwr Cymru Welsh Water | Tremadog Bay | LLANDANWG TERMINAL PS | 29 | 227 | 99.7 |
Dwr Cymru Welsh Water | River Eden | CSO at BRONABER STW | 55 | 211 | 99.9 |
Dwr Cymru Welsh Water | River Rhydhir | LON COB BACH PS PWLLHELI | 50 | 207 | 99.7 |
Dwr Cymru Welsh Water | Tremadog Bay | HARLECH TERMINAL PS (OUTFALL A) | 17 | 206 | 99.9 |
Dwr Cymru Welsh Water | Dyffryn Main Drain | DYFFRYN ARDUDWY WWTW STORM | 30 | 199 | 100 |
Dwr Cymru Welsh Water | A Stream On Nw Boundary Of The Site | CSO at Talsarnau SPS | 54 | 195 | 100 |
Dwr Cymru Welsh Water | Coastal Waters | CRICCIETH EAST PS , , | 20 | 182 | 96.5 |
Dwr Cymru Welsh Water | Unnamed Stream | HARLECH TERMINAL PS (OUTFALL B) | 16 | 161 | 99.9 |
Dwr Cymru Welsh Water | Tremadog Bay | CRICCIETH WEST PS | 24 | 156 | 99.5 |
Dwr Cymru Welsh Water | River Prysor | Trawsfynydd Maesgwindy Est CSO | 82 | 139 | 99.1 |
Dwr Cymru Welsh Water | River Geirch | MORFA NEFYN PUMPING STATION CSO (B) | 70 | 131 | 95.7 |
Dwr Cymru Welsh Water | Desach | ABERDESACH PS | 91 | 118 | 99.9 |
Dwr Cymru Welsh Water | River Dysynni | Abergynolwyn STW (Settled Storm) | 39 | 116 | 100 |
Dwr Cymru Welsh Water | River Prysor | CSO at Trawsfynydd WwTW | 13 | 112 | 5.8 |
Dwr Cymru Welsh Water | Dysynni Low Level Drainage Cha | TYWYN STW MORFA GWYLLT TYWYN , | 35 | 110 | 99.8 |
Dwr Cymru Welsh Water | Tremadog Bay | Llanbedrog SPS | 7 | 109 | 100 |
Dwr Cymru Welsh Water | River Dyfi | ABERDYFI WHARF PS SEAVIEW TERRACE | 16 | 109 | 100 |
Dwr Cymru Welsh Water | Unnamed Ditch | ARTHOG TERRACE SEWAGE PUMPING ST | 18 | 104 | 99.9 |
Dwr Cymru Welsh Water | River Geirch | Edern SPS CSO | 29 | 93 | 100 |
Dwr Cymru Welsh Water | River Penrhos | CSO at Penrhos WwTW | 52 | 91 | 98.9 |
Dwr Cymru Welsh Water | River Wnion | Marian Mawr CSO | 57 | 85 | 99.8 |
Dwr Cymru Welsh Water | River Wen | AFONWEN WWTW PS | 20 | 85 | 100 |
Dwr Cymru Welsh Water | River Wnion | STAYLITTLE LANE CSO | 39 | 71 | 100 |
Dwr Cymru Welsh Water | Ffos Ddu | Marian Mawr Splitter Chamber CSO | 17 | 48 | 100 |
Dwr Cymru Welsh Water | Coastal Waters - River Daron | ABERDARON PS | 23 | 40 | 100 |
Dwr Cymru Welsh Water | River Y Llan | Llanfachreth STW (Storm) CSO | 14 | 39 | 100 |
Dwr Cymru Welsh Water | Nant Y Cyt | CHAPEL STREET/MADOG STREET PORTHM | 98 | 37 | 98.8 |
Dwr Cymru Welsh Water | Ditch | Idris Villas Sewage Pumping Station | 21 | 30 | 87.6 |
Dwr Cymru Welsh Water | Coastal Waters | Llwyngwril SPS | 14 | 30 | 100 |
Dwr Cymru Welsh Water | Groundwater Via Infiltration System | ST MARY'S SEWAGE PUMPING STATION | 19 | 27 | 100 |
Dwr Cymru Welsh Water | Unnamed Ditch | CASTELL PUMPING STATION | 5 | 27 | 99.9 |
Dwr Cymru Welsh Water | River Henddol | FAIRBOURNE PUMPING STATION | 6 | 26 | 100 |
Dwr Cymru Welsh Water | Cardigan Bay | BARMOUTH WWTW OUTFALL TO MLWS | 16 | 25 | 94.8 |
Dwr Cymru Welsh Water | Unnamed Ditch | GLASFRYN TERRACE STW ARTHOG | 5 | 24 | 98.6 |
Dwr Cymru Welsh Water | River Glaslyn | BORTH Y GES PS | 32 | 24 | 100 |
Dwr Cymru Welsh Water | Glaslyn Estuary Within Glaslyn | PORTHMADOG STW STORM STORAGE PORT | 10 | 23 | 96.6 |
Dwr Cymru Welsh Water | Un-Named Stream | PORTHMADOG - LOMBARD STREET SS | 39 | 23 | 73 |
Dwr Cymru Welsh Water | River Prysor | CSO at Trawsfynydd Near Bron Gwyndy | 14 | 16 | 78.8 |
Dwr Cymru Welsh Water | River Cyll-Y-Felin | CSO at Aberdaron WwTW | 2 | 15 | 100 |
Dwr Cymru Welsh Water | Mawddach Estuary | BARMOUTH HARBOUR PUMPING STATION | 9 | 9 | 100 |
Dwr Cymru Welsh Water | Dulas North | Minffordd St CSO, Corris | 4 | 8 | 99.9 |
Dwr Cymru Welsh Water | Unnamed Stream | Trefor CSO | 21 | 8 | 99.7 |
Dwr Cymru Welsh Water | Un-Named Watercourse | BRYNCOCH SEWAGE PUMPING STATION | 3 | 7 | 100 |
Dwr Cymru Welsh Water | Stream Leading To Cyt Stre | TREMADOG SSO | 6 | 6 | 100 |
Dwr Cymru Welsh Water | Un-Named Watercourse | LLANERCH CSO | 20 | 6 | 98.1 |
Dwr Cymru Welsh Water | River Bowydd | Blaenau Ffestiniog WWTW Settled Storm (B) | 4 | 5 | 100 |
Dwr Cymru Welsh Water | Unnamed Stream | CSO Rear Of Prysor Filling Station Traw | 10 | 4 | 100 |
Dwr Cymru Welsh Water | River Mawddach | Dolgellau Main PS | 2 | 2 | 100 |
Dwr Cymru Welsh Water | Barlwyd | BLAENAU FFESTINIOG NO2 | 5 | 2 | 50 |
Dwr Cymru Welsh Water | River Dysynni | Abergynolwyn SPS | 6 | 2 | 100 |
Dwr Cymru Welsh Water | Tremadog Bay | CSO ON SEWER (CRICCIETH BEACH) | 2 | 2 | 93.8 |
Dwr Cymru Welsh Water | Glaslyn Estuary | PORTHMADOG STW STORM STORAGE PORT | 3 | 2 | 99.6 |
Dwr Cymru Welsh Water | River Mawddach | Llanelltyd CSO | 7 | 2 | 98.9 |
Dwr Cymru Welsh Water | Unnamed Stream | FRIOG SEWAGE PUMPING STATION | 3 | 2 | 99.8 |
Dwr Cymru Welsh Water | Mawddach | MAWDDACH CRESCENT PUMPING STATION | 1 | 0 | 99.8 |
Dwr Cymru Welsh Water | River Bowydd | Blaenau Ffestiniog CSO No 3 | 2 | 0 | 100 |
Dwr Cymru Welsh Water | River Dwyryd | Harlech Rum Hole CSO | 2 | 0 | 99.8 |
Dwr Cymru Welsh Water | Esturial Waters River Erch | GLAN Y DON PS PWLLHELI | 1 | 0 | 96.1 |
Dwr Cymru Welsh Water | Esturial Waters Of River Erch | GIMBLET ROCK TIDAL TANK CSO | 1 | 0 | 99.9 |
Dwr Cymru Welsh Water | Tremadog Bay | CSO at Llandanwg SPS | 0 | 0 | 100 |
Dwr Cymru Welsh Water | River Soch Estuary | ABERSOCH HARBOUR PUMPING STATION | 0 | 0 | 100 |
Dwr Cymru Welsh Water | Unnamed Culvert To River Artro | Llanbedr CSO | 0 | 0 | 99.4 |
Dwr Cymru Welsh Water | River Dwyryd | MAENTWROG CSO | 0 | 0 | 0 |
Dwr Cymru Welsh Water | River Glaslyn | AMMANDA TERRACE BORTH Y GEST PORTHM | 0 | 0 | 37.3 |
Dwr Cymru Welsh Water | River Glaslyn | BRITANNIA PS | 0 | 0 | 78.4 |
Dwr Cymru Welsh Water | Unnamed Stream | HARLECH OUTSIDE LAUNDRY | 0 | 0 | 0 |
Dwr Cymru Welsh Water | River Geirch | NEFYN WWTW (CONT. S/WATER OUTFALL) | 0 | 0 | 0 |
Dwr Cymru Welsh Water | Groundwater Via Infiltration System | WESLEYAN TERRACE SEWAGE PUMPING ST | 0 | 0 | 100 |
Dwr Cymru Welsh Water | River Dwyfawr | LLANYSTUMDWY PUMPING STATION | 0 | 0 | 100 |
Dwr Cymru Welsh Water | Esturial Waters Of River Erch | MORFA GARREG PS PWLLHELI | 0 | 0 | 99.9 |
Dwr Cymru Welsh Water | River Erch | BRIDGE GARAGE PWLLHELI | 0 | 0 | 100 |
Dwr Cymru Welsh Water | Tremadog Bay | CRICCIETH EAST PS | 0 | 0 | 0 |
Dwr Cymru Welsh Water | River Rhyd Hir Estuary | Y MAES CSO | 0 | 0 | 100 |
Dwr Cymru Welsh Water | River Dwyfawr | Llanystumdwy (W Porthmadog) A (Settled Storm) | 0 | 0 | 0 |
Dwr Cymru Welsh Water | Angell | Aberangell No1 PS | 0 | 0 | 0 |
Dwr Cymru Welsh Water | Un-Named Stream | MORFA BYCHAN WWTW | 0 | 0 | 98.7 |
Dwr Cymru Welsh Water | Nant Y Cyt | BAKERS LANE/CHANDLERS PLACE PORTH | 0 | 0 | 100 |
EDM (Event Duration Monitoring) data and Consented Discharges to Controlled Waters with Conditions from Environment Agency & Data Map Wales
Experimental derived data from Thames Water API, Some data may be missing or inaccurate. This uses Environment Agency rainfall data from the real-time data API (Beta) - Rainfall data is delayed by up to two days.
This website is intended to provide an accurate representation of the Environment Agency data. The data is hard to use, and thus some errors may have been made. If you find something that is incorrect, please raise an issue at the GitHub issues page and we'll endeavour to fix it quickly.
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