Dwyfor Meirionnydd

Polluted by sewage 10,578 times in 2024 lasting 88,682 hours - That's 10.26 years!

Monitoring was disabled in some locations, so could be more

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Constituency

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✔ means we have experimental daily data since 2023

Totals for Dwyfor Meirionnydd in 2024

175 Sites polluted by Dwr Cymru Welsh Water

10,578 sewage dumps

88,682 hours duration

That's 10.26 years! On average 29 times a day

Change Over Time

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Constituencies near Dwyfor Meirionnydd

Waterways in Dwyfor Meirionnydd

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Pollution Summary 2024

Here are all the reported sewage overflow totals for Dwyfor Meirionnydd in 2024. Sometimes sewage can be being dumped for months at a time.

Reporting refers to how much of the time the monitoring was active. In this constituency 5 of the total 192 CSO locations had reporting enabled for less than half the year. Of these 1 had zero reporting.

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Dwr Cymru Welsh Water	Nant Brisgyll	CSO at Llan Ffestiniog Sewage Treatment Works	361	3,666	100
Dwr Cymru Welsh Water	River Llyfni	Settled Storm Sewage at Llanllyfni WwTW	243	3,416	99.1
Dwr Cymru Welsh Water	Coastal Waters	FAIRBOURNE WWTW STORM TANKS	160	3,209	99.9
Dwr Cymru Welsh Water	River Goedol	BLAENAU FFESTINIOG WWTW (Settled STORM)	178	2,803	99.4
Dwr Cymru Welsh Water	River Rhyd Hir	CSO at Llithfaen WwTW	138	2,670	99.3
Dwr Cymru Welsh Water	Tremadog Bay	CRICCIETH STW FINAL	200	2,657	99.95
Dwr Cymru Welsh Water	River Erch	CSO at Four Crosses STW	145	2,549	99.8
Dwr Cymru Welsh Water	River Erch	Abererch WwTW Storm Overflow	119	2,238	99.9
Dwr Cymru Welsh Water	River Seiont	PENISARWAUN WWTW FE	212	2,203	99.8
Dwr Cymru Welsh Water	River Cadnant	BETHEL SEWAGE TRANSFER PS	146	2,199	98.5
Dwr Cymru Welsh Water	Caernarfon Bay	NEFYN PUMPING STATION	160	2,197	99.9
Dwr Cymru Welsh Water	River Artro	LLANBEDR TERMINAL PS (STORM)	150	2,176	99.9
Dwr Cymru Welsh Water	River Seiont	Llanrug WwTW Settled Storm	128	2,094	100
Dwr Cymru Welsh Water	Tyddyn Drain To Coastal Waters	TREFOR WWTW	169	1,983	99.4
Dwr Cymru Welsh Water	Tremadog Bay	Criccieth STW CSO to Settled Storm Sewage Tanks	122	1,919	100
Dwr Cymru Welsh Water	Mawddach	Llanelltyd PS CSO	116	1,889	98.1
Dwr Cymru Welsh Water	River Wen	CSO at Chwilog STW	106	1,688	99.2
Dwr Cymru Welsh Water	Dulas	LOWER CORRIS STW	85	1,656	47
Dwr Cymru Welsh Water	River Cedron	PENTREFELIN STW	137	1,562	99.2
Dwr Cymru Welsh Water	Gwyrfai	LLANFAGLAN WWTW FINAL EFFLUENT	148	1,545	99.9
Dwr Cymru Welsh Water	River Llyfni	Nantlle PS	117	1,470	97.4
Dwr Cymru Welsh Water	River Seiont	Storm Overflow at Penisarwaun Wastewater Treatment Works	130	1,413	99.8
Dwr Cymru Welsh Water	River Rhyd Hir	LLANNOR STW (SETTLED STORM)	138	1,351	99.9
Dwr Cymru Welsh Water	River Gwyrfai	WAUNFAWR STW (FINAL EFFLUENT)	104	1,296	100
Dwr Cymru Welsh Water	River Dee	BALA WWTW	132	1,286	100
Dwr Cymru Welsh Water	River Dyfi	ABERDYFI WHARF PS SEAVIEW TERRACE	80	1,148	99.8
Dwr Cymru Welsh Water	Dyffryn Main Drain	DYFFRYN ARDUDWY WWTW STORM	84	1,068	99.9
Dwr Cymru Welsh Water	River Mawddach	Penmaenpool PS	96	1,038	97.8
Dwr Cymru Welsh Water	River Dwyryd	Penrhyndeudraeth CSO	113	1,023	99.9
Dwr Cymru Welsh Water	River Seiont	LLANBERIS WwTW	136	1,008	99.9
Dwr Cymru Welsh Water	Erch	FOURCROSSES Wastewater Treatment Works	130	996	100
Dwr Cymru Welsh Water	River Rhyd Hir	Settled Storm Overflow at Efailnewydd Wastewater Treatment Works	109	972	99.8
Dwr Cymru Welsh Water	River Barlwyd	LAND OPP GLANLLYN NR OAKLEY SQUARE CSO	157	961	100
Dwr Cymru Welsh Water	River Prysor	CSO at Trawsfynydd WwTW	95	959	99.8
Dwr Cymru Welsh Water	Estuarial Waters Of River Dwyryd	MAENTWROG WWTW	84	885	99.5
Dwr Cymru Welsh Water	River Geirch	NEFYN WWTW	128	851	99.3
Dwr Cymru Welsh Water	River Seiont	Pont Rhythallt Pumping Station	132	824	99.9
Dwr Cymru Welsh Water	River Ceunant Sych	CSO at Land Off A496 Manod Blaenau Ffesti	114	806	99.2
Dwr Cymru Welsh Water	Erch	ABERERCH WWTW	46	790	99.5
Dwr Cymru Welsh Water	Unnamed Stream	HARLECH TERMINAL PS (OUTFALL B)	62	767	99.9
Dwr Cymru Welsh Water	Nant Brisgyll	CSO at Llanffestiniog STW	114	761	100
Dwr Cymru Welsh Water	Tremadog Bay	HARLECH TERMINAL PS (OUTFALL A)	58	716	99.9
Dwr Cymru Welsh Water	River Rhythallt	LLANRUG WWTW FINAL	70	712	100
Dwr Cymru Welsh Water	River Glaslyn	CSO at Beddgelert East Bank Afon Glaslyn	75	645	97
Dwr Cymru Welsh Water	Cardigan Bay	BARMOUTH WWTW LONG SEA OUTFALL	184	642	99.6
Dwr Cymru Welsh Water	River Llyfni	Talysarn No 4 - CSO	95	623	99.8
Dwr Cymru Welsh Water	Wen	CHWILOG STW	33	590	99.5
Dwr Cymru Welsh Water	River Tafarn Helyg	GELLILYDAN STW (SETTLED STORM)	54	569	98.9
Dwr Cymru Welsh Water	River Caledffrwd	Llwyn Celyn CSO Deinolen	125	566	96.9
Dwr Cymru Welsh Water	River Bowydd	CWM BOWYDD SSO BLAENAU FFESTINIOG	89	533	99.7
Dwr Cymru Welsh Water	Cyt Bach Surface Watercourse	SNOWDON STREET PS	135	530	99.9
Dwr Cymru Welsh Water	Cwmllechen	BONTDDU STW	55	520	99.9
Dwr Cymru Welsh Water	River Goedol	CSO at Land Off Pencefn Road Tanygrisiau	76	511	98.2
Dwr Cymru Welsh Water	River Llyfni	Pontllyfni STW-CSO Pontllyfni	39	495	99.9
Dwr Cymru Welsh Water	Un-Named Stream Into Llifon	Dorlan Goch CSO	141	439	89.4
Dwr Cymru Welsh Water	Unnamed Ditch	ARTHOG TERRACE SEWAGE PUMPING ST	38	405	99.9
Dwr Cymru Welsh Water	River Blaen-Y-Cae	BRYNCIR STW	83	342	99.8
Dwr Cymru Welsh Water	River Gwyrfai	Bontnewydd CSO	102	334	97.1
Dwr Cymru Welsh Water	Unnamed Stream	CSO At Corwen Rear Of The Pavillion	67	325	97.9
Dwr Cymru Welsh Water	Tremadog Bay	CRICCIETH EAST PS	29	311	99.2
Dwr Cymru Welsh Water	River Carrog	CSO at Caernarfon Hen Gastell No5	87	309	98.4
Dwr Cymru Welsh Water	Rhyd Hir	LLITHFAEN STW	27	284	99.3
Dwr Cymru Welsh Water	River Dysynni	Abergynolwyn STW (Settled Storm)	47	282	99.9
Dwr Cymru Welsh Water	A Stream On Nw Boundary Of The Site	CSO at Talsarnau SPS	62	278	99.9
Dwr Cymru Welsh Water	Tremadog Bay	LLANDANWG TERMINAL PS	22	277	99.9
Dwr Cymru Welsh Water	River Dyfrdwy	The Eagles CSO, Llanwchllyn	54	276	98.2
Dwr Cymru Welsh Water	Tremadog Bay	MORFA BYCHAN WWTW	111	274	99.9
Dwr Cymru Welsh Water	Tremadog Bay	MORFA BYCHAN WWTW	111	274	99.9
Dwr Cymru Welsh Water	Dysynni Low Level Drainage Cha	TYWYN STW MORFA GWYLLT TYWYN ,	68	265	99.8
Dwr Cymru Welsh Water	River Rhydhir	LON COB BACH PS PWLLHELI	61	263	99.2
Dwr Cymru Welsh Water	River Llyfni	Llanllyfni Glan Aber CSO	130	262	97.5
Dwr Cymru Welsh Water	Cwmllechen	BONTDDU STW	30	260	100
Dwr Cymru Welsh Water	Unnamed Stream	MYNYTHO STW - STORM OVERFLOW	63	254	100
Dwr Cymru Welsh Water	River Llyfni	Talysarn No 3 - CSO	33	251	53.2
Dwr Cymru Welsh Water	River Dee	CORWEN WWTW FINAL EFFLUENT	38	237	99.8
Dwr Cymru Welsh Water	River Dee	CSO at Cynwyd STW	79	236	99.8
Dwr Cymru Welsh Water	Coastal Waters Of Cardigan Bay	TYWYN STW MORFA GWYLLT TYWYN	48	219	99.9
Dwr Cymru Welsh Water	River Seiont	CAERNARFON WWTW INLET PUMP ST 6MM	81	219	99.7
Dwr Cymru Welsh Water	Groundwater Via Infiltration System	WESLEYAN TERRACE SEWAGE PUMPING ST	14	209	99.9
Dwr Cymru Welsh Water	River Caledffwrd	BRYNREFAIL MAIN SPS	38	201	99.8
Dwr Cymru Welsh Water	Tafarn Helyg	GELLILYDAN STW	33	194	99.9
Dwr Cymru Welsh Water	Carrog	CAERNARFON - RHOSTRYFAN CSO NO	76	185	99.9
Dwr Cymru Welsh Water	River Dee	Corwen Corner Station Yard CSO	34	183	65.8
Dwr Cymru Welsh Water	Coastal Waters - River Daron	ABERDARON PS	33	173	87.4
Dwr Cymru Welsh Water	River Wnion	STAYLITTLE LANE CSO	35	167	99.9
Dwr Cymru Welsh Water	Tremadog Bay	Llanbedrog SPS	16	164	99.5
Dwr Cymru Welsh Water	River Geirch	Edern SPS CSO	36	164	99.8
Dwr Cymru Welsh Water	River Geirch	MORFA NEFYN PUMPING STATION CSO (B)	87	163	98.1
Dwr Cymru Welsh Water	Gwyrfai	CAERNARFON - RHOSTRYFAN CSO NO	73	162	89.7
Dwr Cymru Welsh Water	River Wnion	Marian Mawr CSO	62	159	99.4
Dwr Cymru Welsh Water	River Eden	BRONABER STW	20	157	100
Dwr Cymru Welsh Water	Unnamed Stream	Clynnog Fawr CSO at PS	55	156	99.9
Dwr Cymru Welsh Water	Unknown	CSO at Tai Craig-y-don Cwymyglo	24	152	98.5
Dwr Cymru Welsh Water	Dee	CYNWYD STW FINAL EFFLUENT	31	140	100
Dwr Cymru Welsh Water	Cegin	RHIWLAS STW	84	139	99.9
Dwr Cymru Welsh Water	Dwyfawr	GARNDOLBENMAEN STW	28	135	100
Dwr Cymru Welsh Water	River Llifon	Caernarfon - Llwyn Gwalch CSO Groes	46	134	99.9
Dwr Cymru Welsh Water	Cadnant - Caernarfon	SSO AT MILL LANE CAERNARFON	83	128	99.4
Dwr Cymru Welsh Water	River Cyll-Y-Felin	CSO at Aberdaron WwTW	28	124	99.2
Dwr Cymru Welsh Water	Ffos Ddu	Marian Mawr Splitter Chamber CSO	27	112	99.2
Dwr Cymru Welsh Water	Coastal Waters	Llwyngwril SPS	29	111	99.7
Dwr Cymru Welsh Water	Coastal Waters Of Cardigan Bay	TYWYN STW MORFA GWYLLT TYWYN	27	108	99.9
Dwr Cymru Welsh Water	River Gwyrfai	CSO at Bontnewydd Glanrafon No10	52	107	93.4
Dwr Cymru Welsh Water	Rhyd	CAERNARFON - GLANRHYD SSO NO.	80	104	75.8
Dwr Cymru Welsh Water	Llyn Nantlle Uchaf	Nantlle No 5-CSO	45	100	98.2
Dwr Cymru Welsh Water	Of River Rhyd Hir	EFAILNEWYDD STW	62	99	100
Dwr Cymru Welsh Water	River Henddol	FAIRBOURNE PUMPING STATION	19	99	97.3
Dwr Cymru Welsh Water	Goch Bach	CSO Near Castle Gift Shop Llanberis	32	98	98.4
Dwr Cymru Welsh Water	River Prysor	Trawsfynydd Maesgwindy Est CSO	43	90	99.9
Dwr Cymru Welsh Water	Of River Soch	MYNYTHO STW - STORM OVERFLOW	43	86	100
Dwr Cymru Welsh Water	River Wen	AFONWEN WASTEWATER TREATMENT WORKS	10	82	100
Dwr Cymru Welsh Water	River Wen	AFONWEN WWTW PS	11	78	99.5
Dwr Cymru Welsh Water	Seiont	CAERNARFON PONT SEIONT PS	10	77	82.8
Dwr Cymru Welsh Water	Un-Named Watercourse	BRYNCOCH SEWAGE PUMPING STATION	7	74	98.7
Dwr Cymru Welsh Water	River Llan	CAERNARFON - PENYGROES SSO NO.	69	66	99.9
Dwr Cymru Welsh Water	Cadnant	BETHEL SSO NO. 2	6	64	99.7
Dwr Cymru Welsh Water	Unnamed Stream	FRIOG SEWAGE PUMPING STATION	10	64	99.9
Dwr Cymru Welsh Water	River Glaslyn	BORTH Y GES PS	33	60	99.3
Dwr Cymru Welsh Water	River Llyfni	PONTLLYFNI STW	7	57	100
Dwr Cymru Welsh Water	Menai Straits	CROSSVILLE CSO	57	57	99.9
Dwr Cymru Welsh Water	River Dysynni	Abergynolwyn SPS	31	54	99.6
Dwr Cymru Welsh Water	River Hwch	Llanberis CSO NO. 2	33	51	91.2
Dwr Cymru Welsh Water	Cyt Mawr Stream	TALSARNAU STW	12	50	100
Dwr Cymru Welsh Water	Unnamed Ditch	CASTELL PUMPING STATION	8	45	99.9
Dwr Cymru Welsh Water	River Seiont	Peblig Industrial Estate CSO	24	42	99
Dwr Cymru Welsh Water	River Y Llan	LLANFACHRETH WWTW	9	40	100
Dwr Cymru Welsh Water	River Dwyfawr	LLANYSTUMDWY PUMPING STATION	19	37	95.7
Dwr Cymru Welsh Water	Tremadog Bay	CRICCIETH WEST PS	24	36	97.5
Dwr Cymru Welsh Water	River Mawddach	Llanelltyd CSO	13	35	99.1
Dwr Cymru Welsh Water	River Penrhos	CSO at Penrhos WwTW	25	34	99.5
Dwr Cymru Welsh Water	Dulas North	Minffordd St CSO, Corris	3	33	99.7
Dwr Cymru Welsh Water	River Seiont	CAERNARFON STW	4	32	99.3
Dwr Cymru Welsh Water	Cardigan Bay	BARMOUTH WWTW OUTFALL TO MLWS	27	31	99.9
Dwr Cymru Welsh Water	Unnamed Watercourse	CAERNARFON MARGARET STREET SSO	63	29	97.7
Dwr Cymru Welsh Water	Un-Named Stream	PORTHMADOG - LOMBARD STREET SS	84	28	98.6
Dwr Cymru Welsh Water	River Glaslyn	BRITANNIA PS	9	23	99.9
Dwr Cymru Welsh Water	River Seiont	Caernarfon WWTW Inlet Pump ST 6mm SPS	29	21	82.6
Dwr Cymru Welsh Water	Cadnant	BETHEL SSO NO. 3	10	20	99.8
Dwr Cymru Welsh Water	Dwyryd	PENRHYNDEUDRAETH OUTFALL-SCREE	5	19	99.8
Dwr Cymru Welsh Water	Nant Y Cyt	CHAPEL STREET/MADOG STREET PORTHM	20	18	86.2
Dwr Cymru Welsh Water	Tremadog Bay	CSO ON SEWER (CRICCIETH BEACH)	7	18	99.4
Dwr Cymru Welsh Water	River Ceidiog	Llandrillo STW PS CSO	24	17	99.9
Dwr Cymru Welsh Water	Llyn Padarn	LLANBERIS PS , ,	11	17	98.9
Dwr Cymru Welsh Water	Stream Leading To Cyt Stre	TREMADOG SSO	15	17	99.9
Dwr Cymru Welsh Water	River Prysor	CSO at Trawsfynydd Near Bron Gwyndy	21	16	99.3
Dwr Cymru Welsh Water	River Eden	CSO at BRONABER STW	5	14	99.2
Dwr Cymru Welsh Water	River Cadnant	BETHEL CSO BETHEL NEAR CAERNARFON	13	14	99.6
Dwr Cymru Welsh Water	Unnamed Stream	HARLECH OUTSIDE LAUNDRY	12	13	99.3
Dwr Cymru Welsh Water	River Geirch	NEFYN WWTW (CONT. S/WATER OUTFALL)	16	13	100
Dwr Cymru Welsh Water	River Glaslyn	CSO at Porthmadog Borth-Y-Gest SPS	25	12	99.4
Dwr Cymru Welsh Water	River Y Llan	Llanfachreth STW (Storm) CSO	19	11	100
Dwr Cymru Welsh Water	Mawddach Estuary	BARMOUTH HARBOUR PUMPING STATION	12	11	99.8
Dwr Cymru Welsh Water	Mawddach	MAWDDACH CRESCENT PUMPING STATION	3	8	99.9
Dwr Cymru Welsh Water	River Rhyd Hir Estuary	Y MAES CSO	6	8	99.9
Dwr Cymru Welsh Water	River Bowydd	Blaenau Ffestiniog WWTW Settled Storm (B)	9	7	99.4
Dwr Cymru Welsh Water	Un-Named Watercourse	LLANERCH CSO	19	7	99.1
Dwr Cymru Welsh Water	Unnamed Ditch	GLASFRYN TERRACE STW ARTHOG	5	6	99.9
Dwr Cymru Welsh Water	Cadnant	MIN-Y-NANT CSO	12	6	99.6
Dwr Cymru Welsh Water	Barlwyd	BLAENAU FFESTINIOG NO2	10	4	72.8
Dwr Cymru Welsh Water	River Geirch	NEFYN WWTW	3	4	100
Dwr Cymru Welsh Water	Unnamed Stream	Trefor CSO	4	4	20.7
Dwr Cymru Welsh Water	River Gwyrfai	Bontnewydd CSO Ysgol Gynradd Bontne	7	3	99.9
Dwr Cymru Welsh Water	Angell	Aberangell No1 PS	2	3	6.5
Dwr Cymru Welsh Water	Unnamed Stream	CSO Rear Of Prysor Filling Station Traw	7	2	99.9
Dwr Cymru Welsh Water	Groundwater Via Infiltration System	ST MARY'S SEWAGE PUMPING STATION	2	2	99.7
Dwr Cymru Welsh Water	Esturial Waters River Erch	GLAN Y DON PS PWLLHELI	2	1	92.8
Dwr Cymru Welsh Water	River Dwyryd	Harlech Rum Hole CSO	3	1	64
Dwr Cymru Welsh Water	River Glaslyn	AMMANDA TERRACE BORTH Y GEST PORTHM	3	0	54.5
Dwr Cymru Welsh Water	Nant Y Cyt	BAKERS LANE/CHANDLERS PLACE PORTH	2	0	98.7
Dwr Cymru Welsh Water	Tremadog Bay	CSO at Llandanwg SPS	2	0	99.8
Dwr Cymru Welsh Water	River Mawddach	Dolgellau Main PS	2	0	99.8
Dwr Cymru Welsh Water	River Soch Estuary	ABERSOCH HARBOUR PUMPING STATION	1	0	99.3
Dwr Cymru Welsh Water	Esturial Waters Of River Erch	GIMBLET ROCK TIDAL TANK CSO	1	0	99.7
Dwr Cymru Welsh Water	Esturial Waters Of River Erch	MORFA GARREG PS PWLLHELI	1	0	99.9
Dwr Cymru Welsh Water	River Siont	ANGLESEY ARMS PUMPING STATION	1	0	99.7
Dwr Cymru Welsh Water	River Dwyryd	MAENTWROG CSO	0	0	0
Dwr Cymru Welsh Water	Dee Via Surface Water Sewer And Culvert	Corwen Clawdd Poncen PS	0	0	99.9
Dwr Cymru Welsh Water	River Glaslyn	Settled Storm at Beddgelert Waste Water Treatment	0	0	100
Dwr Cymru Welsh Water	Menai Straits	CAERNARFON BANK QUAY PS	0	0	99.9
Dwr Cymru Welsh Water	River Dwyfawr	Llanystumdwy (W Porthmadog) A (Settled Storm)	0	0	95.8
Dwr Cymru Welsh Water	River Caledffrwd	CSO at Pen yr Olchfa Clwt Y Bont Deiniolen	0	0	98.8
Dwr Cymru Welsh Water	Un-Named Stream	MORFA BYCHAN WWTW	0	0	99.9
Dwr Cymru Welsh Water	River Erch	BRIDGE GARAGE PWLLHELI	0	0	99.2
Dwr Cymru Welsh Water	River Glaslyn	BEDDGELERT WASTE WATER TREATMENT	0	0	99
Dwr Cymru Welsh Water	Dwyfawr	LLANYSTUMDWY A WWTW	0	0	99.5
Dwr Cymru Welsh Water	River Dwyfor	CSO at Garndolbenmaen STW	0	0	99.7
Dwr Cymru Welsh Water	Unnamed Culvert To River Artro	Llanbedr CSO	0	0	92.2
Dwr Cymru Welsh Water	Menai Strait	WATERLOO PORT SEWAGE PUMPING ST	0	0	98.9
Dwr Cymru Welsh Water	River Seiont	CAERNARFON WWTW STORM TANKS	0	0	100
Dwr Cymru Welsh Water	Menai Straits	BALACLAVA ROAD SEWAGE PUMPING ST	0	0	99.9
Dwr Cymru Welsh Water	Dulas North	LOWER CORRIS STW	0	0	29
Dwr Cymru Welsh Water	River Bowydd	Blaenau Ffestiniog CSO No 3	0	0	99.9

Data Sources & Accuracy

EDM (Event Duration Monitoring) data and Consented Discharges to Controlled Waters with Conditions from Environment Agency & Data Map Wales, and Scottish Water

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 10,578 times in 2024 lasting 88,682 hours - That's 10.26 years! Monitoring was disabled in some locations, so could be more

Dwyfor Meirionnydd