Dwyfor Meirionnydd polluted by sewage 6,039 times in 2022 - lasting 49,174 hours

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Constituency

✔ means we have experimental daily data for 2023

Totals for Dwyfor Meirionnydd in 2022

104 Sites polluted by Dwr Cymru Welsh Water

6,039 sewage dumps
49,174 h duration

That's 5.69 years! On average 16.5 times a day

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Constituencies near Dwyfor Meirionnydd

Waterways in Dwyfor Meirionnydd

Pollution Summary 2022

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

Data Sources & Accuracy

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.

This project is not associated, approved or endorsed by any of the companies whose logos you see here.

Analysing sewage pollution by the Water Industry

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Dwyfor Meirionnydd polluted by sewage 6,039 times in 2022 - lasting 49,174 hours

104 Sites polluted by Dwr Cymru Welsh Water

Pollution Summary 2022

Data Sources & Accuracy

Media Queries

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