Ynys Môn polluted by sewage 2,878 times in 2022 - lasting 18,813 hours

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Constituency

✔ means we have experimental daily data for 2023

Totals for Ynys Môn in 2022

72 Sites polluted by Dwr Cymru Welsh Water

2,878 sewage dumps
18,813 h duration

That's 2.18 years! On average 7.9 times a day

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Constituencies near Ynys Môn

Waterways in Ynys Môn

Pollution Summary 2022

Here are all the reported sewage overflow totals for Ynys Môn 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	Menai Strait	PS NO 3 (SUSPENSION BRIDGE) (EMERGE	109	1,640	100
Dwr Cymru Welsh Water	Menai Strait	PS NO 3 (SUSPENSION BRIDGE) (EMERGE	109	1,640	100
Dwr Cymru Welsh Water	Unnamed Watercourse To River Goch	Rhosybol Gorslwyd PS	110	1,354	99.5
Dwr Cymru Welsh Water	Ditch	Hermon Malltraeth PS	72	1,067	95.3
Dwr Cymru Welsh Water	Unnamed Draining To New Harbour	Porth y Felin Sewage Pumping Station	87	972	96.6
Dwr Cymru Welsh Water	River Meddanen	LLANFECHELL PUMPING STATION	68	926	100
Dwr Cymru Welsh Water	Cadnant	PONT LLANDEGFAN SEWAGE PUMPING STAT	63	897	96.6
Dwr Cymru Welsh Water	Menai Strait	LLANDEGFAN (MENAI) PUMPING STATION	54	794	100
Dwr Cymru Welsh Water	Un-Named Watercourse	VALLEY STORM PS (GRAVITY DISCHARGE)	79	750	99.6
Dwr Cymru Welsh Water	Menai Strait	BRYNSCIENCYN STW	74	744	100
Dwr Cymru Welsh Water	Abberffraw Bay	ABERFFRAW WASTE WATER TREATMENT WKS	185	565	80.1
Dwr Cymru Welsh Water	River Nodwydd	PENTRAETH STW	67	541	100
Dwr Cymru Welsh Water	Estuarial Waters Of Holy Island Strait South	Four Mile Bridge SPS Holyhead	35	487	100
Dwr Cymru Welsh Water	Unnamed Stream	VALLEY DYFFRYN AND PENDYFFRYN	23	461	100
Dwr Cymru Welsh Water	Menai Strait	MOUNT FIELD P.S. BEAUMARIS ,	86	426	93
Dwr Cymru Welsh Water	Bull Bay	Bull Bay P.S.	70	352	99.5
Dwr Cymru Welsh Water	Coastal Waters	BENLLECH WWTW (STW) LSO BENLLECH	63	343	100
Dwr Cymru Welsh Water	River Cadnant	Gorsllwyd Sewage Pumping Station	60	340	100
Dwr Cymru Welsh Water	Menai Strait	Llanfair PG WwTW CSO	103	323	98.8
Dwr Cymru Welsh Water	Menai Strait	PS NO 1 (FAELOG CAUSEWAY) (EMERGENC	52	292	100
Dwr Cymru Welsh Water	Menai Strait	PS NO 1 (FAELOG CAUSEWAY) (EMERGENC	52	292	100
Dwr Cymru Welsh Water	Irish Sea	RHOSNEIGR SPS RHOSNEIGR	22	263	100
Dwr Cymru Welsh Water	Menai Strait	LLANFAES WWTW STORM TANK	39	260	98.9
Dwr Cymru Welsh Water	Braint	Gaerwen Station SPS	35	252	99.1
Dwr Cymru Welsh Water	River Briant	LLANDDANIEL PONT Y CRUG SPS	32	243	98.6
Dwr Cymru Welsh Water	Unnamed Stream	GWALCHMAI ISAF PS	29	209	41
Dwr Cymru Welsh Water	Un-Named Watercourse	HOLYHEAD WWTW FINAL EFFLUENT PS	105	177	100
Dwr Cymru Welsh Water	Esturial Waters Of Inland Sea	TREARDDUR BAY PS (PUMPED DISCHARGE)	57	172	99.8
Dwr Cymru Welsh Water	Old Harbour	Holyhead Wastewater Treatment Works SPS	64	159	100
Dwr Cymru Welsh Water	Outer Harbour, Holyhead	Morawelon SPS	41	156	99.6
Dwr Cymru Welsh Water	Un-Named Watercourse	Valley Storm PS (Pumped Discharge)	52	148	99.6
Dwr Cymru Welsh Water	New Harbour	Coastguard CSO	82	120	100
Dwr Cymru Welsh Water	Un-Named Watercourse	TREARDDUR BAY PS (GRAVITY)	31	118	99.4
Dwr Cymru Welsh Water	Menai Strait	LLEINIOG PS	30	105	41.2
Dwr Cymru Welsh Water	Alan Catchment	RHOSYBOL PLAS Y FFRWD SPS	22	98	100
Dwr Cymru Welsh Water	Cefni - Cefni Reservoir West	Lon Sardis CSO (BODFFORDD OPP CAPEL SARDIS)	68	87	100
Dwr Cymru Welsh Water	River Goch	Storm Tank Army Cadet Centre CSO	30	67	98
Dwr Cymru Welsh Water	Unnamed Stream	Llangaffo STW CSO	66	65	100
Dwr Cymru Welsh Water	Menai Strait	WEST END PS BEAUMARIS ANGLESEY	22	64	100
Dwr Cymru Welsh Water	Estuarial Waters Of River Alaw	Gorad PS Gorad NR Valley Anglesey	22	60	99.3
Dwr Cymru Welsh Water	Adjacent Ditch	Llangefni Rhostrehwfa CSO	13	59	100
Dwr Cymru Welsh Water	Coastal Waters	MOELFRE PS MOELFRE	12	58	100
Dwr Cymru Welsh Water	River Goch	Craig Y Don SPS	7	55	8.2
Dwr Cymru Welsh Water	River Cefni	Llangefni Main Pumping Station	9	47	99.9
Dwr Cymru Welsh Water	Coastal Waters Of Irish Sea	CEMAES PS/BALANCING TANK CEMAES BAY	15	43	99.9
Dwr Cymru Welsh Water	Unnamed Ditch	LLANGAFFO CAE BERLLAN SPS	5	43	99.7
Dwr Cymru Welsh Water	Braint	LLANFAIR PG SPS	21	41	100
Dwr Cymru Welsh Water	Coastal Waters - Amlwch Harbour	Amlwch Port CSO	34	39	100
Dwr Cymru Welsh Water	River Braint	NEWBOROUGH STW	19	38	98.4
Dwr Cymru Welsh Water	Llyn Maelog	BRYN DU SEWAGE PUMPING STATION	9	34	99.7
Dwr Cymru Welsh Water	Menai Strait	GLYN GARTH PS LLANDEGFAN	20	29	100
Dwr Cymru Welsh Water	Unnamed Watercourse	LLANFAES PS (EMERGENCY) , ,	4	24	99.9
Dwr Cymru Welsh Water	New Harbour	Hibernia Row Pumping Station	2	24	100
Dwr Cymru Welsh Water	Cefni Estuary	MALLTRAETH WWTW - STORM	40	23	99.5
Dwr Cymru Welsh Water	Cefni Reservoir By-Pass Channel	Bodffordd STW Settled Storm	13	23	100
Dwr Cymru Welsh Water	Cefni	CSO Llangefni MH Front Ynys Mon Of	36	22	99.6
Dwr Cymru Welsh Water	Menai Strait	BRYNSCIENCYN PS	6	22	100
Dwr Cymru Welsh Water	Menai Strait	RHIANFA PS LLANDEGFAN	17	22	82.9
Dwr Cymru Welsh Water	Menai Strait	BRYNSCIENCYN PS , ,	6	21	100
Dwr Cymru Welsh Water	Unnamed Ditch	TALWRN SPS	18	20	100
Dwr Cymru Welsh Water	River Cefni	LLANGEFNI WWTW STORM OVERFLOW	33	17	99.4
Dwr Cymru Welsh Water	Y Brenin	PONT Y BRENIN PS	9	12	99.7
Dwr Cymru Welsh Water	Cadnant	LLANSADWRN PS	3	10	96.2
Dwr Cymru Welsh Water	Coastal Waters	CYNLAI PS LLANGOED ANGLESEY	4	9	98.6
Dwr Cymru Welsh Water	Via A Drainage To River Clai	CSO at Llangefni MH Rear of Burgess	14	7	99.9
Dwr Cymru Welsh Water	Coastal Waters	WENDON CAR PARK PS BENLLECH , , ,	6	4	100
Dwr Cymru Welsh Water	Braint	DWYRAN RHYDWYN - SSO	13	4	81.6
Dwr Cymru Welsh Water	River Goch	Settled Storm Tank at Llanerchymedd STW	3	3	100
Dwr Cymru Welsh Water	Nant Cwyrtai	GWALCHMAI STW	6	2	100
Dwr Cymru Welsh Water	New Harbour, Holyhead	WATERSIDE PUMPING STATION	7	2	100
Dwr Cymru Welsh Water	Cefni Estuary	MALLTRAETH WWTW TERMINAL	2	1	99.5
Dwr Cymru Welsh Water	Nodwydd	PENTRAETH TAN Y GRAIG SPS	2	0	100
Dwr Cymru Welsh Water	Unnamed Ditch	FRYARS BAY P.S- SCREENED EMERG	0	0	100
Dwr Cymru Welsh Water	River Alaw	Bodedern Sewage Pumping Station	0	0	100
Dwr Cymru Welsh Water	Eastuary - River Cefni	MALLTRAETH VILLAGE PUMPING STATION	0	0	0
Dwr Cymru Welsh Water	Cefni	MALLTRAETH VILLAGE CSO	0	0	0
Dwr Cymru Welsh Water	Coastal Waters	RHOSNEIGR STW (SETTLED STORM/EMERGE	0	0	46.1
Dwr Cymru Welsh Water	Menai Strait	LLYN Y FELIN PS (EMERGENCY)	0	0	99.4
Dwr Cymru Welsh Water	Menai Strait	PS NO 2 (PORTH WRACH) (EMERGENCY)	0	0	100
Dwr Cymru Welsh Water	River Alaw	Newlands Beach PS Valley Angle	0	0	99.9
Dwr Cymru Welsh Water	River Cadnant	LLANSADWRN PS	0	0	80.4
Dwr Cymru Welsh Water	Coastal Waters	Llaneilian SPS	0	0	0
Dwr Cymru Welsh Water	Braint	DWYRAN BY SCHOOL - SSO	0	0	0
Dwr Cymru Welsh Water	Of Braint	LLANFAIRPWLL SSO NO. 2	0	0	0
Dwr Cymru Welsh Water	Menai Strait	PS NO 2 (PORTH WRACH) (EMERGENCY)	0	0	100
Dwr Cymru Welsh Water	Beddmanarch Bay	PENRHOS BEACH PUMPING STATION	0	0	100
Dwr Cymru Welsh Water	Adj Ditch	TREARDDUR BAY HAUL A MOR SPS	0	0	100
Dwr Cymru Welsh Water	River Cefni	Gaerwen WWTW Settled Storm	0	0	100
Dwr Cymru Welsh Water	Menai Strait	LLYN Y FELIN PS (EMERGENCY) , ,	0	0	99.4
Dwr Cymru Welsh Water	Unnamed Ditch	NEWBOROUGH MILLBANK SPS	0	0	0
Dwr Cymru Welsh Water	River Ffraw	ABERFFRAW SPS GLAN Y MOR ABERFFRAW	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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Ynys Môn polluted by sewage 2,878 times in 2022 - lasting 18,813 hours

72 Sites polluted by Dwr Cymru Welsh Water

Pollution Summary 2022

Data Sources & Accuracy

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