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Polluted by sewage 307 times in 2025 lasting 1,342 hours
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Donate NowHere are all the reported sewage overflow totals for Conwy 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 place all the declared CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s appeared to have monitoring enabled for more than 50% of the year
| Company | Waterway | Site | Sewage Dumps | Duration (Hours) | Reporting % |
|---|---|---|---|---|---|
| Dwr Cymru Welsh Water | Coastal Waters Of Penrhyn Bay | GANOL WWTW (STW) GLAN CONWY CORNER | 73 | 524 | 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 | River Conwy | DEGANWY PS MARINE CRESCENT DEGANWY | 80 | 228 | 99.9 |
| 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 | 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 | Unnamed Ditch | LLANDUDNO LLANRHOS SPS | 9 | 14 | 99.9 |
| Dwr Cymru Welsh Water | River Conwy | TYWYN PS | 12 | 13 | 97.7 |
| Dwr Cymru Welsh Water | River Ganol | GANOL STW PS GLAN CONWY CORNER | 6 | 5 | 99.9 |
| Dwr Cymru Welsh Water | Conwy Estuary | DEGANWY ROAD DEGANWY | 5 | 4 | 92.1 |
| Dwr Cymru Welsh Water | River Wydden | CONWY ROAD STORM PS | 2 | 3 | 99.9 |
| 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 | Gyffin | ST. AGNES ROAD CSO | 1 | 0 | 99.9 |
| Dwr Cymru Welsh Water | Unnamed Ditch | DEGANWY BEACH SPS | 0 | 0 | 99.9 |
| Dwr Cymru Welsh Water | River Wydden | WOODLANDS P.S WOODLANDS ESTATE MARL | 0 | 0 | 99.9 |
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.
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Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org