Arfon polluted by sewage 3,168 times in 2022 - lasting 18,374 hours

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Constituency

✔ means we have experimental daily data for 2023

Totals for Arfon in 2022

52 Sites polluted by Dwr Cymru Welsh Water

3,168 sewage dumps
18,374 h duration

That's 2.13 years! On average 8.7 times a day

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Constituencies near Arfon

Waterways in Arfon

Pollution Summary 2022

Here are all the reported sewage overflow totals for Arfon 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 Cadnant	BETHEL SEWAGE TRANSFER PS	150	2,472	97.3
Dwr Cymru Welsh Water	River Ogwen	Settled Storm Overflow at Tregarth Wastewater Treatment Works	109	1,810	100
Dwr Cymru Welsh Water	River Seiont	CAERNARFON WWTW STORM TANKS	120	1,276	99.9
Dwr Cymru Welsh Water	River Llyfni	Nantlle PS	102	1,266	97.4
Dwr Cymru Welsh Water	River Gwyrfai	CSO at Waunfawr STW	97	1,145	98
Dwr Cymru Welsh Water	River Seiont	Pont Rhythallt Pumping Station	122	1,065	100
Dwr Cymru Welsh Water	River Seiont	Llanrug WwTW Settled Storm	72	860	55.4
Dwr Cymru Welsh Water	River Seiont	Storm Overflow at Penisarwaun Wastewater Treatment Works	123	758	100
Dwr Cymru Welsh Water	River Seiont	LLANBERIS WwTW	109	722	100
Dwr Cymru Welsh Water	River Gwyrfai	Llanfaglan WwTW Settled Storm Overflow	74	709	99.9
Dwr Cymru Welsh Water	River Ogwen	BETHESDA WWTW STORM	92	580	99.6
Dwr Cymru Welsh Water	Menai Strait	Treborth WwTW (Settled Storm)	74	508	99.8
Dwr Cymru Welsh Water	River Caledffrwd	Llwyn Celyn CSO Deinolen	133	494	98
Dwr Cymru Welsh Water	River Gwyrfai	Bontnewydd CSO	97	464	86.5
Dwr Cymru Welsh Water	River Ogwen	Fron Ogwen PS	27	414	99.7
Dwr Cymru Welsh Water	River Llan	CAERNARFON - PENYGROES SSO NO.	58	396	62.7
Dwr Cymru Welsh Water	Cfgin	GLASINFRYN SPS CSO	54	395	99.9
Dwr Cymru Welsh Water	River Llyfni	Talysarn No 4 - CSO	80	307	94.7
Dwr Cymru Welsh Water	River Ogwen	Rock Terrace CSO Bethesda	71	262	100
Dwr Cymru Welsh Water	Un-Named Stream Into Llifon	Dorlan Goch CSO	84	256	73.1
Dwr Cymru Welsh Water	River Carrog	CSO at Caernarfon Hen Gastell No5	81	250	99.3
Dwr Cymru Welsh Water	River Seiont	CAERNARFON WWTW INLET PUMP ST 6MM	97	220	99.9
Dwr Cymru Welsh Water	River Llyfni	Llanllyfni Glan Aber CSO	127	195	98.6
Dwr Cymru Welsh Water	Rhyd	CAERNARFON - GLANRHYD SSO NO.	112	178	99.5
Dwr Cymru Welsh Water	Carrog	CAERNARFON - RHOSTRYFAN CSO NO	84	153	99.9
Dwr Cymru Welsh Water	River Cegin	RHIWLAS STW	90	142	100
Dwr Cymru Welsh Water	Cadnant - Caernarfon	SSO AT MILL LANE CAERNARFON	84	119	100
Dwr Cymru Welsh Water	Gwyrfai	CAERNARFON - RHOSTRYFAN CSO NO	67	117	95.5
Dwr Cymru Welsh Water	River Caledffwrd	BRYNREFAIL MAIN SPS	34	115	96.4
Dwr Cymru Welsh Water	River Llifon	Caernarfon - Llwyn Gwalch CSO Groes	45	113	87.7
Dwr Cymru Welsh Water	Llyn Nantlle Uchaf	Nantlle No 5-CSO	60	100	99.2
Dwr Cymru Welsh Water	Menai Strait	FELINHELI PS (QUAY COTTAGE) , ,	12	80	100
Dwr Cymru Welsh Water	Menai Straits	CROSSVILLE CSO	56	56	100
Dwr Cymru Welsh Water	River Ogwen	RACHUB MAES BLEDDYN CSO	41	53	99.8
Dwr Cymru Welsh Water	Unnamed Watercourse	CAERNARFON MARGARET STREET SSO	103	53	99.6
Dwr Cymru Welsh Water	River Hwch	Llanberis CSO NO. 2	37	45	99.8
Dwr Cymru Welsh Water	Goch Bach	CSO Near Castle Gift Shop Llanberis	21	41	99.3
Dwr Cymru Welsh Water	Menai Strait	BEACH ROAD PS BANGOR ,	40	37	95.9
Dwr Cymru Welsh Water	River Seiont	Peblig Industrial Estate CSO	17	22	83.6
Dwr Cymru Welsh Water	Menai Strait	TREBORTH STW (FINAL) BANGOR	19	16	99.8
Dwr Cymru Welsh Water	River Gwyrfai	CSO at Bontnewydd Glanrafon No10	21	15	40.4
Dwr Cymru Welsh Water	Llyn Padarn	LLANBERIS PS , ,	7	14	99.8
Dwr Cymru Welsh Water	River Cadnant	BETHEL CSO BETHEL NEAR CAERNARFON	14	14	98.5
Dwr Cymru Welsh Water	Cadnant	BETHEL SSO NO. 3	8	13	100
Dwr Cymru Welsh Water	Menai Strait	ABERGWYNGREGYN PUMPING STATION	3	11	100
Dwr Cymru Welsh Water	Cadnant	MIN-Y-NANT CSO	21	10	100
Dwr Cymru Welsh Water	River Y Llan	LLANLLECHID SPS , ,	3	6	99.9
Dwr Cymru Welsh Water	Menai Strait	Gorad Road SPS	4	3	100
Dwr Cymru Welsh Water	Menai Strait	COLEG NORMAL SEWAGE PUMPING STATION	7	3	100
Dwr Cymru Welsh Water	River Gwyrfai	Bontnewydd CSO Ysgol Gynradd Bontne	3	2	100
Dwr Cymru Welsh Water	River Ogwen	TALYBONT STW	1	1	100
Dwr Cymru Welsh Water	River Cegin	GLAENTRAETH ESTATE PS BANGOR ,	1	0	99.6
Dwr Cymru Welsh Water	Menai Straits	CAERNARFON BANK QUAY PS	0	0	99.8
Dwr Cymru Welsh Water	River Seiont	Caernarfon WWTW Inlet Pump ST 6mm SPS	0	0	0
Dwr Cymru Welsh Water	River Llyfni	Talysarn No 3 - CSO	0	0	80.4
Dwr Cymru Welsh Water	Menai Strait	FELINHELI PS (ADJ TO QUAY TOILETS)	0	0	100
Dwr Cymru Welsh Water	Menai Strait	WATERLOO PORT SEWAGE PUMPING ST	0	0	99.7
Dwr Cymru Welsh Water	Cadnant	BETHEL SSO NO. 2	0	0	100
Dwr Cymru Welsh Water	Unknown	CSO at Tai Craig-y-don Cwymyglo	0	0	0
Dwr Cymru Welsh Water	Menai Strait	FELINHELI PS (OPP SEA CADET CORPS)	0	0	100
Dwr Cymru Welsh Water	Estuarial Waters	Meirion Road PS (Storm/Emerg)	0	0	100
Dwr Cymru Welsh Water	River Siont	ANGLESEY ARMS PUMPING STATION	0	0	0
Dwr Cymru Welsh Water	Menai Straits	BALACLAVA ROAD SEWAGE PUMPING ST	0	0	99.8
Dwr Cymru Welsh Water	Seiont	CAERNARFON PONT SEIONT PS	0	0	100
Dwr Cymru Welsh Water	River Caledffrwd	CSO at Pen yr Olchfa Clwt Y Bont Deiniolen	0	0	92.6

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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Arfon polluted by sewage 3,168 times in 2022 - lasting 18,374 hours

52 Sites polluted by Dwr Cymru Welsh Water

Pollution Summary 2022

Data Sources & Accuracy

Media Queries

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