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Bangor Conwy Môn

Polluted by sewage 7,821 times in 2025 lasting 74,355 hours - That's 8.61 years!

Monitoring was disabled in some locations, so could be more

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Totals for Bangor Conwy Môn in 2025

166 Sites polluted by Dwr Cymru Welsh Water

7,821 sewage dumps

74,355 hours duration

That's 8.61 years. On average 21.4 times a day

Change Over Time

Senedd Constituencies near Bangor Conwy Môn

Westminster Constituencies within Bangor Conwy Môn

To see live data by overflow, go to the Westminster Constituency, then 'live data'

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Bangor Conwy Môn in 2025. 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 3 of the total 181 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway locations had reporting enabled for less than half the year. Of these 3 had zero reporting.

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Dwr Cymru Welsh Water	River Lledr	DOLWYDDELAN WWTW	176	3,186	99.8
Dwr Cymru Welsh Water	Llugwy	Capel Curig Wastewater Treatment Works	243	3,034	99.9
Dwr Cymru Welsh Water	Menai Strait	BRYNSCIENCYN STW	184	2,785	99.9
Dwr Cymru Welsh Water	Unnamed Ditch	LLANGAFFO CAE BERLLAN SPS	121	2,332	99.6
Dwr Cymru Welsh Water	Coastal Waters - Aberffraw Bay	ABERFFRAW WASTE WATER TREATMENT WKS	107	2,217	99.7
Dwr Cymru Welsh Water	Ogwen	TREGARTH	124	2,206	99.9
Dwr Cymru Welsh Water	Conwy Estuary	TREFRIW STW	130	2,012	99.8
Dwr Cymru Welsh Water	Unnamed Ditch	Cwm Penmachno - CSO	128	1,875	99.8
Dwr Cymru Welsh Water	Menai Strait	LLANDEGFAN (MENAI) PUMPING STATION	85	1,707	93.7
Dwr Cymru Welsh Water	Cfgin	GLASINFRYN SPS CSO	101	1,678	99.8
Dwr Cymru Welsh Water	River Ogwen	BETHESDA STW (FINAL) BETHESDA	152	1,646	99.9
Dwr Cymru Welsh Water	Braint	Gaerwen Station SPS	74	1,483	99.5
Dwr Cymru Welsh Water	River Dulas	BETWS YN RHOS STW	85	1,466	99.8
Dwr Cymru Welsh Water	Conwy	DOLGARROG/TALYBONT STW	82	1,458	99.9
Dwr Cymru Welsh Water	Unnamed Draining To New Harbour	Porth y Felin Sewage Pumping Station	87	1,451	99.8
Dwr Cymru Welsh Water	Un-Named Watercourse	VALLEY STORM PS (GRAVITY DISCHARGE)	82	1,340	99.9
Dwr Cymru Welsh Water	Cadnant	PONT LLANDEGFAN SEWAGE PUMPING STAT	72	1,252	94
Dwr Cymru Welsh Water	River Goch	Craig Y Don SPS	75	1,218	99.8
Dwr Cymru Welsh Water	Menai Strait	TREBORTH STW (FINAL) BANGOR	106	1,187	99.85
Dwr Cymru Welsh Water	River Conwy	LLANRWST STW LLLANWRST CONWY	95	1,150	99.9
Dwr Cymru Welsh Water	Bull Bay	Bull Bay P.S.	82	1,142	99.7
Dwr Cymru Welsh Water	Unnamed Ditch	TALWRN SPS	63	1,133	99.9
Dwr Cymru Welsh Water	Coastal Waters Of Conwy Bay	PENMAENMAWR WWTW PENMAENMAWR	62	1,019	99.9
Dwr Cymru Welsh Water	River Ogwen	Fron Ogwen PS	65	994	99.9
Dwr Cymru Welsh Water	Nant Nodwydd	PENTRAETH STW	86	971	99.9
Dwr Cymru Welsh Water	River Hiraethlyn	EGLWYSBACH STW	54	960	99.9
Dwr Cymru Welsh Water	Cefni Reservoir Bypass Channel	BODFFORDD SEWAGE TREATMENT WORKS	72	957	98.8
Dwr Cymru Welsh Water	River Llugwy	Mill Rd SPS	58	937	99.9
Dwr Cymru Welsh Water	River Conwy	Betws y Coed Golf Club PS	82	872	99.8
Dwr Cymru Welsh Water	Estuarial Waters Of River Alaw	Gorad PS Gorad NR Valley Anglesey	60	869	99.6
Dwr Cymru Welsh Water	River Clwyd	PWLLGLAS STW	80	868	99.9
Dwr Cymru Welsh Water	River Braint	LLANGAFFO STW	104	798	99.9
Dwr Cymru Welsh Water	River Llugwy	BETWS Y COED WWTW	106	728	99.9
Dwr Cymru Welsh Water	Coastal Waters Of Conwy Bay	PENMAENMAWR WWTW PENMAENMAWR	45	713	99.8
Dwr Cymru Welsh Water	Irish Sea	RHOSNEIGR SPS RHOSNEIGR	44	696	99.9
Dwr Cymru Welsh Water	Unnamed Watercourse To River Goch	Rhosybol Gorslwyd PS	96	692	99.9
Dwr Cymru Welsh Water	River Dulyn	Dolgarrog CSO No. 2	46	690	99.9
Dwr Cymru Welsh Water	Coastal Waters	Llaneilian SPS	54	688	99.9
Dwr Cymru Welsh Water	Estuarial Waters Of Holy Island Strait South	Four Mile Bridge SPS Holyhead	52	672	99.9
Dwr Cymru Welsh Water	River Machno	LLAN PENMACHNO STW	73	657	99.9
Dwr Cymru Welsh Water	River Ogwen	Rock Terrace CSO Bethesda	85	620	99.9
Dwr Cymru Welsh Water	Braint	LLANFAIR PG SPS	58	618	99.9
Dwr Cymru Welsh Water	Ditch	Hermon Malltraeth PS	49	609	93.4
Dwr Cymru Welsh Water	Menai Strait	ABERGWYNGREGYN PUMPING STATION	32	592	99.3
Dwr Cymru Welsh Water	Menai Strait	LLANFAIR PG WWTW	107	590	99.9
Dwr Cymru Welsh Water	Coastal Waters	RHOSNEIGR STW (SETTLED STORM/EMERGE	39	587	99.9
Dwr Cymru Welsh Water	Estuary Of River Braint	NEWBOROUGH STW	82	559	99.9
Dwr Cymru Welsh Water	Un-Named Watercourse	Valley Storm PS (Pumped Discharge)	76	556	99.9
Dwr Cymru Welsh Water	Llyn Maelog	BRYN DU SEWAGE PUMPING STATION	51	546	99.7
Dwr Cymru Welsh Water	River Briant	LLANDDANIEL PONT Y CRUG SPS	57	528	99.9
Dwr Cymru Welsh Water	Coastal Waters Of Penrhyn Bay	GANOL WWTW (STW) GLAN CONWY CORNER	73	524	99.9
Dwr Cymru Welsh Water	Conwy Bay	DALE ROAD STORM SPS LLANDUDNO	167	504	99.8
Dwr Cymru Welsh Water	River Cadnant	Gorsllwyd Sewage Pumping Station	53	489	99.9
Dwr Cymru Welsh Water	Nant Y Cefn	Settled Storm Overflow at Clawddnewydd Wastewater Treatment Works	38	455	99.9
Dwr Cymru Welsh Water	River Lledr	Screened Storm Sewage at Dolwyddelan WwTW	22	438	100
Dwr Cymru Welsh Water	River Conwy	SPS at Llanrwst STW Llanrwst Conwy	90	428	99.9
Dwr Cymru Welsh Water	Conwy Estuary	GLAN CONWY SPS	28	404	99.9
Dwr Cymru Welsh Water	Llanfairfechan	LLANFAIRFECHAN - SSO	122	387	96.5
Dwr Cymru Welsh Water	Roe	ROWEN STW	98	387	99.9
Dwr Cymru Welsh Water	Esturial Waters Of Inland Sea	TREARDDUR BAY PS (PUMPED DISCHARGE)	64	370	99.9
Dwr Cymru Welsh Water	Menai Strait	PS NO 1 (FAELOG CAUSEWAY) (EMERGENC	60	338	99.9
Dwr Cymru Welsh Water	Menai Strait	PS NO 1 (FAELOG CAUSEWAY) (EMERGENC	60	338	99.9
Dwr Cymru Welsh Water	River Llugwy	Pentre Ddu CSO, Betws-y-Coed	43	338	99.5
Dwr Cymru Welsh Water	Menai Strait	LLANFAES WWTW	53	332	99
Dwr Cymru Welsh Water	Old Harbour	Holyhead Wastewater Treatment Works SPS	87	330	99.9
Dwr Cymru Welsh Water	Coastal Waters Of Penrhyn Bay	GANOL WWTW (STW) GLAN CONWY CORNER	37	321	99.7
Dwr Cymru Welsh Water	Elwy	Llangernyw SPS	88	315	99.9
Dwr Cymru Welsh Water	New Harbour, Holyhead	WATERSIDE PUMPING STATION	84	303	99.9
Dwr Cymru Welsh Water	River Goch	Storm Tank Army Cadet Centre CSO	50	296	99.9
Dwr Cymru Welsh Water	River Cefni	GAERWEN WWTW FINAL EFFLUENT	28	294	97.1
Dwr Cymru Welsh Water	Un-Named Watercourse	HOLYHEAD WWTW FINAL EFFLUENT PS	80	289	99.9
Dwr Cymru Welsh Water	R Nug	CERRIGYDRUDION STW	56	284	99.9
Dwr Cymru Welsh Water	Un-Named Watercourse	TREARDDUR BAY PS (GRAVITY)	42	254	99.2
Dwr Cymru Welsh Water	Outer Harbour, Holyhead	Morawelon SPS	41	230	99.8
Dwr Cymru Welsh Water	River Conwy	DEGANWY PS MARINE CRESCENT DEGANWY	80	228	99.9
Dwr Cymru Welsh Water	River Alaw	Bodedern Sewage Pumping Station	25	225	99.9
Dwr Cymru Welsh Water	River Conwy	Dolgarreg Tan Y Fford SPS	42	224	99.9
Dwr Cymru Welsh Water	River Roe	CSO at Rowen STW	27	211	100
Dwr Cymru Welsh Water	Coastal Waters Off Benllech, A	BENLLECH WWTW (STW) LSO BENLLECH	44	210	99.1
Dwr Cymru Welsh Water	Cefni - Cefni Reservoir West	Lon Sardis CSO (BODFFORDD OPP CAPEL SARDIS)	75	199	98.9
Dwr Cymru Welsh Water	Coastal Waters Of Irish Sea	CEMAES PS/BALANCING TANK CEMAES BAY	43	198	99.9
Dwr Cymru Welsh Water	New Harbour	Coastguard CSO	83	193	99.9
Dwr Cymru Welsh Water	Menai Strait	PS NO 3 (SUSPENSION BRIDGE) (EMERGE	60	185	99.8
Dwr Cymru Welsh Water	Menai Strait	PS NO 3 (SUSPENSION BRIDGE) (EMERGE	60	185	99.8
Dwr Cymru Welsh Water	River Conwy	Tyn Y Groes STW - Storm Overflow	37	183	99.3
Dwr Cymru Welsh Water	River Meddanen	LLANFECHELL PUMPING STATION	19	179	99.3
Dwr Cymru Welsh Water	River Meddanen	Llanfechell Wastewater Treatment Works	22	175	79.9
Dwr Cymru Welsh Water	Penrhyn Bay Via Surface Water Sewer	CSO at Penrhyn Isaf Road	76	166	98.8
Dwr Cymru Welsh Water	Menai Strait	MOUNT FIELD P.S. BEAUMARIS ,	34	163	99.9
Dwr Cymru Welsh Water	Penrhyn Bay	PENRHYN BAY PS MORFA RD PENRHYN BAY	21	162	99.9
Dwr Cymru Welsh Water	River Conwy	Waterloo SPS	26	154	99.6
Dwr Cymru Welsh Water	Menai Strait	LLEINIOG PS	52	145	99.9
Dwr Cymru Welsh Water	River Cefni	Llangefni Main Pumping Station	22	138	99.9
Dwr Cymru Welsh Water	River Ogwen	RACHUB MAES BLEDDYN CSO	54	129	98.5
Dwr Cymru Welsh Water	River Y Llan	LLANLLECHID SPS , ,	13	121	99.9
Dwr Cymru Welsh Water	River Elwy	LLANFAIR STW	21	113	99.9
Dwr Cymru Welsh Water	Menai Strait	BRYNSCIENCYN PS , ,	13	103	99.9
Dwr Cymru Welsh Water	Conwy Bay	WEST SHORE PS ABBEY ROAD LLANDUDNO	17	102	99.9
Dwr Cymru Welsh Water	River Conwy	Tan Y Fford CSO	34	98	99.9
Dwr Cymru Welsh Water	Cefni Estuary	MALLTRAETH WWTW TERMINAL	38	97	99.9
Dwr Cymru Welsh Water	Llanfairfechan	LLANFAIRFECHAN SSO NO. 1	54	96	99.1
Dwr Cymru Welsh Water	River Wydden	GLANWYDDAN PUMPING STATION	14	96	98.4
Dwr Cymru Welsh Water	Unnamed Watercourse	Tan-y-Fedw CSO, Trefriw (MH No. 104)	18	92	99.4
Dwr Cymru Welsh Water	Menai Strait	BRYNSCIENCYN PS	12	90	99.9
Dwr Cymru Welsh Water	Unnamed Ditch	FRYARS BAY P.S- SCREENED EMERG	22	88	99.9
Dwr Cymru Welsh Water	Alan Catchment	RHOSYBOL PLAS Y FFRWD SPS	29	88	100
Dwr Cymru Welsh Water	River Lledr	CSO & SPS Nr 2250 Dolwyddlean	29	85	98.8
Dwr Cymru Welsh Water	Adjacent Ditch	Llangefni Rhostrehwfa CSO	18	69	99.9
Dwr Cymru Welsh Water	Coastal Waters	MOELFRE PS MOELFRE	20	69	99.9
Dwr Cymru Welsh Water	River Wydden	MARL DRIVE CSO LLANDUDNO JUNCTION	9	67	99.9
Dwr Cymru Welsh Water	Menai Strait	RHIANFA PS LLANDEGFAN	22	61	99.9
Dwr Cymru Welsh Water	Menai Strait	WEST END PS BEAUMARIS ANGLESEY	16	55	99.9
Dwr Cymru Welsh Water	Nant Cwyrtai	GWALCHMAI STW	33	54	99.5
Dwr Cymru Welsh Water	Estuarial Waters Of River Conwy	Gyffin PS Morfa Bach Conwy	28	54	99.8
Dwr Cymru Welsh Water	Coastal Waters - Amlwch Harbour	Amlwch Port CSO	22	51	99.5
Dwr Cymru Welsh Water	Cefni	MALLTRAETH VILLAGE CSO	22	47	92.2
Dwr Cymru Welsh Water	Eastuary - River Cefni	MALLTRAETH VILLAGE PUMPING STATION	22	47	92.2
Dwr Cymru Welsh Water	Cefni	CSO Llangefni MH Front Ynys Mon Of	46	45	98.3
Dwr Cymru Welsh Water	River Conwy	LLANDUDNO JUNCTION PS	15	45	99.9
Dwr Cymru Welsh Water	Y Brenin	PONT Y BRENIN PS	13	43	99.9
Dwr Cymru Welsh Water	New Harbour	Hibernia Row Pumping Station	11	40	99.9
Dwr Cymru Welsh Water	River Merddwr	Pentrefoelas - CSO	13	38	99.8
Dwr Cymru Welsh Water	Menai Strait	BEACH ROAD PS BANGOR ,	35	35	77.7
Dwr Cymru Welsh Water	River Conwy	Betwys Y Coed Muriau P.S.	26	31	99.9
Dwr Cymru Welsh Water	Conwy Estuary	MORFA PS MORFA DRIVE MORFA CONWY	16	31	99.7
Dwr Cymru Welsh Water	River Conwy	QUAY PS CONWY QUAY CONWY	12	30	99.9
Dwr Cymru Welsh Water	Via A Drainage To River Clai	CSO at Llangefni MH Rear of Burgess	19	29	99.8
Dwr Cymru Welsh Water	Unnamed Stream	VALLEY DYFFRYN AND PENDYFFRYN	7	29	99.9
Dwr Cymru Welsh Water	Coastal Waters Via Sw Culvert	STATION ROAD CSO	11	24	99.9
Dwr Cymru Welsh Water	River Cefni	LLANGEFNI STW LLANGEFNI ANGLESEY	38	24	99.9
Dwr Cymru Welsh Water	River Nant-Y-Goron	BRYN AFON CSO	74	21	99.4
Dwr Cymru Welsh Water	River Ogwen	TALYBONT STW	19	19	99.9
Dwr Cymru Welsh Water	Unnamed Ditch	LLANDUDNO LLANRHOS SPS	9	14	99.9
Dwr Cymru Welsh Water	Coastal Waters	PENMAENMAWR PROMENADE PS	7	14	96.6
Dwr Cymru Welsh Water	River Conwy	TYWYN PS	12	13	97.7
Dwr Cymru Welsh Water	Ganol	PENRHYN BAY LLANDUNDNO ROAD -	19	10	99.8
Dwr Cymru Welsh Water	Un-Named Stream	PENRHYN BAY LLANDUNDNO ROAD -	4	10	99.9
Dwr Cymru Welsh Water	Unnamed Ditch	NEWBOROUGH MILLBANK SPS	10	10	99.9
Dwr Cymru Welsh Water	A Culverted River Conwy	Llanwrst CSO	4	9	92.8
Dwr Cymru Welsh Water	Menai Strait	COLEG NORMAL SEWAGE PUMPING STATION	5	6	99.9
Dwr Cymru Welsh Water	Coastal Waters	WENDON CAR PARK PS BENLLECH , , ,	3	6	85.8
Dwr Cymru Welsh Water	River Ganol	GANOL STW PS GLAN CONWY CORNER	6	5	99.9
Dwr Cymru Welsh Water	Coastal Waters - Penrhyn Bay	PENRHYN HILL PENRHYN BAY	9	4	99.5
Dwr Cymru Welsh Water	Conwy Estuary	DEGANWY ROAD DEGANWY	5	4	92.1
Dwr Cymru Welsh Water	Menai Strait	GLYN GARTH PS LLANDEGFAN	7	4	99.9
Dwr Cymru Welsh Water	River Aled	Llansannan Ddol CSO	5	3	99.6
Dwr Cymru Welsh Water	River Wydden	CONWY ROAD STORM PS	2	3	99.9
Dwr Cymru Welsh Water	Nant Mawr	Pentre Llanrhaedr PS	1	2	99.9
Dwr Cymru Welsh Water	Braint	DWYRAN RHYDWYN - SSO	9	2	99.9
Dwr Cymru Welsh Water	River Dulas	CSO AT BETTWYS YN RHOS SPORTS GROUND	1	2	100
Dwr Cymru Welsh Water	Unnamed Watercourse	LLANFAES PS (EMERGENCY) , ,	1	2	99.7
Dwr Cymru Welsh Water	Of Braint	LLANFAIRPWLL SSO NO. 2	7	2	96.1
Dwr Cymru Welsh Water	Nant Garreg Ddu	GLAN Y MOR PUMPING STATION	3	1	99.9
Dwr Cymru Welsh Water	Nodwydd	PENTRAETH TAN Y GRAIG SPS	2	1	99.9
Dwr Cymru Welsh Water	River Ffraw	ABERFFRAW SPS GLAN Y MOR ABERFFRAW	2	0	99.9
Dwr Cymru Welsh Water	Braint	DWYRAN BY SCHOOL - SSO	2	0	99.6
Dwr Cymru Welsh Water	Beddmanarch Bay	PENRHOS BEACH PUMPING STATION	1	0	100
Dwr Cymru Welsh Water	Gyrach	PENMAENMAWR WWTW PENMAENMAWR	1	0	99.8
Dwr Cymru Welsh Water	River Cegin	GLAENTRAETH ESTATE PS BANGOR ,	1	0	99.9
Dwr Cymru Welsh Water	Menai Strait	Gorad Road SPS	1	0	99.5
Dwr Cymru Welsh Water	Gyffin	HENDRE ROAD SSO	1	0	99.9
Dwr Cymru Welsh Water	Unnamed Watercourse	IND ESTATE LLANDUDNO JUNCTION GLAN	1	0	99.9
Dwr Cymru Welsh Water	Estuarial Waters	Meirion Road PS (Storm/Emerg)	1	0	99.9
Dwr Cymru Welsh Water	Gyffin	ST. AGNES ROAD CSO	1	0	99.9
Dwr Cymru Welsh Water	Coastal Waters	CYNLAI PS LLANGOED ANGLESEY	1	0	99.9
Dwr Cymru Welsh Water	River Cadnant	LLANSADWRN PS	1	0	99.9
Dwr Cymru Welsh Water	River Conwy	CSO NEAR PS NO 2 TREFRIW	0	0	0
Dwr Cymru Welsh Water	Unnamed Ditch	DEGANWY BEACH SPS	0	0	99.9
Dwr Cymru Welsh Water	Conway Bay	LLANFAIRFECHAN HOSPITAL SPS	0	0	99.9
Dwr Cymru Welsh Water	River Wydden	WOODLANDS P.S WOODLANDS ESTATE MARL	0	0	99.9
Dwr Cymru Welsh Water	Un-Named Of Alaw	BODEDERN STW	0	0	0
Dwr Cymru Welsh Water	Unnamed Stream	GWALCHMAI ISAF PS	0	0	99.9
Dwr Cymru Welsh Water	River Goch	LLANERCHYMEDD STW	0	0	99.9
Dwr Cymru Welsh Water	Cadnant	LLANSADWRN PS	0	0	0
Dwr Cymru Welsh Water	Menai Strait	LLYN Y FELIN PS (EMERGENCY)	0	0	95.5
Dwr Cymru Welsh Water	Menai Strait	LLYN Y FELIN PS (EMERGENCY) , ,	0	0	95.5
Dwr Cymru Welsh Water	River Alaw	Newlands Beach PS Valley Angle	0	0	99.9
Dwr Cymru Welsh Water	Menai Strait	PS NO 2 (PORTH WRACH) (EMERGENCY)	0	0	99.8
Dwr Cymru Welsh Water	Menai Strait	PS NO 2 (PORTH WRACH) (EMERGENCY)	0	0	99.8
Dwr Cymru Welsh Water	River Goch	Settled Storm Tank at Llanerchymedd STW	0	0	100
Dwr Cymru Welsh Water	Adj Ditch	TREARDDUR BAY HAUL A MOR SPS	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. Live sewage data from Stream Water API

Annual figures up to and including 2025 come from official water company returns. The 2026 figure is our own estimate, derived continuously from the companies' live data feeds.

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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