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

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2022
© Top of the Poops 2021-2023
✔ 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

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.