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Polluted by sewage 465 times in 2025 lasting 3,118 hours
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Donate NowHere are all the reported sewage overflow totals for Blaenau Ffestiniog 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 | River Bowydd | CWM BOWYDD SSO BLAENAU FFESTINIOG | 109 | 916 | 99.9 |
| Dwr Cymru Welsh Water | River Ceunant Sych | CSO at Land Off A496 Manod Blaenau Ffesti | 123 | 773 | 97.4 |
| Dwr Cymru Welsh Water | River Barlwyd | LAND OPP GLANLLYN NR OAKLEY SQUARE CSO | 117 | 634 | 99.5 |
| Dwr Cymru Welsh Water | River Goedol | CSO at Land Off Pencefn Road Tanygrisiau | 80 | 446 | 98.9 |
| Dwr Cymru Welsh Water | River Goedol | BLAENAU FFESTINIOG WWTW (Settled STORM) | 22 | 334 | 100 |
| Dwr Cymru Welsh Water | Barlwyd | BLAENAU FFESTINIOG NO2 | 12 | 13 | 98.6 |
| Dwr Cymru Welsh Water | River Bowydd | Blaenau Ffestiniog CSO No 3 | 2 | 0 | 99.9 |
| Dwr Cymru Welsh Water | River Bowydd | Blaenau Ffestiniog WWTW Settled Storm (B) | 0 | 0 | 100 |
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.
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