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Bangor Aberconwy

Polluted by sewage 3,992 times in 2025 lasting 38,118 hours - That's 4.41 years!

Monitoring was disabled in some locations, so could be more

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024

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Live data for Bangor Aberconwy in 2026

So far this year (as of 18 May 2026, 12:00) there has been 15,886 hours of sewage overflows, from 93 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s - that's 1.84 years!

Totals for Bangor Aberconwy in 2025

84 Sites polluted by Dwr Cymru Welsh Water
3,992 sewage dumps
38,118 hours duration
That's 4.41 years. On average 10.9 times a day

Change Over Time

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Waterways in Bangor Aberconwy

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Bangor Aberconwy 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 1 of the total 88 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 1 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 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 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 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 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 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 River Hiraethlyn EGLWYSBACH STW 54 960 99.9
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 River Clwyd PWLLGLAS STW 80 868 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 River Dulyn Dolgarrog CSO No. 2 46 690 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 Menai Strait ABERGWYNGREGYN PUMPING STATION 32 592 99.3
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 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 River Llugwy Pentre Ddu CSO, Betws-y-Coed 43 338 99.5
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 R Nug CERRIGYDRUDION STW 56 284 99.9
Dwr Cymru Welsh Water River Conwy DEGANWY PS MARINE CRESCENT DEGANWY 80 228 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 River Conwy Tyn Y Groes STW - Storm Overflow 37 183 99.3
Dwr Cymru Welsh Water Penrhyn Bay Via Surface Water Sewer CSO at Penrhyn Isaf Road 76 166 98.8
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 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 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 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 River Lledr CSO & SPS Nr 2250 Dolwyddlean 29 85 98.8
Dwr Cymru Welsh Water River Wydden MARL DRIVE CSO LLANDUDNO JUNCTION 9 67 99.9
Dwr Cymru Welsh Water Estuarial Waters Of River Conwy Gyffin PS Morfa Bach Conwy 28 54 99.8
Dwr Cymru Welsh Water River Conwy LLANDUDNO JUNCTION PS 15 45 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 Coastal Waters Via Sw Culvert STATION ROAD CSO 11 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 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 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 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 River Dulas CSO AT BETTWYS YN RHOS SPORTS GROUND 1 2 100
Dwr Cymru Welsh Water Nant Garreg Ddu GLAN Y MOR PUMPING STATION 3 1 99.9
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 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

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

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.

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Analysing sewage pollution by the Water Industry

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