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Polluted by sewage 972 times in 2025 lasting 3,460 hours
Monitoring was disabled in some locations, so could be more
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Donate NowHere are all the reported sewage overflow totals for Tredegar 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 1 of the total 23 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 Ebbw | RIVERSIDE DOCTORS SURGERY EBBW VALE CSO | 102 | 758 | 99.9 |
| Dwr Cymru Welsh Water | River Sirhowy | Tredegar Park Place CSO | 161 | 709 | 94.9 |
| Dwr Cymru Welsh Water | River Sirhowy | CSO 32075 Opposite Garibaldi Bridge | 75 | 302 | 99.1 |
| Dwr Cymru Welsh Water | River Sirhowy | A CSO AT REAR OF CHURCH SQ TREDEGAR | 79 | 250 | 99.8 |
| Dwr Cymru Welsh Water | River Sirhowy | CSO at Tredegar, South of Pochin Crescent | 39 | 233 | 91.1 |
| Dwr Cymru Welsh Water | River Sirhowy | CSO OPP 1 DUKESTOWN ROAD TREDEGAR | 60 | 228 | 99.9 |
| Dwr Cymru Welsh Water | River Sirhowy | CSO Opposite White Lion Cottages | 55 | 199 | 99.3 |
| Dwr Cymru Welsh Water | River Sirhowy | CSO at Tredegar, Edward Terrace Nr River Bridge | 69 | 190 | 99 |
| Dwr Cymru Welsh Water | Sirhowy River | CSO at Tredegar, Vicarage Road Rear of Hill Rest | 56 | 178 | 99.3 |
| Dwr Cymru Welsh Water | Sirhowy River | CSO 32084 Scwrfa Road, Tredegar | 43 | 96 | 99.9 |
| Dwr Cymru Welsh Water | River Sirhowy | CSO at Tredegar, Railway View, opposite No13 | 52 | 64 | 99.5 |
| Dwr Cymru Welsh Water | Ebbw River | Tredegar Rd Nr 62A, Ebbw Vale | 29 | 64 | 99.7 |
| Dwr Cymru Welsh Water | Sirhowy River | Tredegar Vale Terrace R/O 61 | 40 | 42 | 99.7 |
| Dwr Cymru Welsh Water | Sirhowy River | Morgan St CSO, Tredegar | 38 | 42 | 99.6 |
| Dwr Cymru Welsh Water | Nant Melyn/Rasa Brook | Coedcae House CSO | 18 | 32 | 99.2 |
| Dwr Cymru Welsh Water | River Sirhowy | CSO at Tredegar, Vale Terrace R/O 101 U/S Garage | 31 | 29 | 92.1 |
| Dwr Cymru Welsh Water | River Sirhowy | CSO at Tredegar, Brompton SSO 1 MH No GN86A | 10 | 27 | 99.7 |
| Dwr Cymru Welsh Water | Sirhowy River | Tredegar Ladies Row CSO o/s School Entrance | 10 | 9 | 99.6 |
| Dwr Cymru Welsh Water | Rasa Brook | Under Flyover | 3 | 0 | 99.1 |
| Dwr Cymru Welsh Water | River Sirhowy | CSO at Tredegar, Vale Terrace R/O 123 | 2 | 0 | 100 |
| Dwr Cymru Welsh Water | Sirhowy River | CSO AT REAR OF NO1 ALEXANDRA PLACE | 0 | 0 | 0 |
| Dwr Cymru Welsh Water | River Ebbw | CSO at R/O PH Beaufort Rd / R/O 23 Lillian Grove | 0 | 0 | 100 |
| Dwr Cymru Welsh Water | River Sirhowy | CSO at St James Close Maes-Y-Coed,Tredegar | 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
Annual figures up to and including 2025 come from official water company returns. The 2026 figure is our own estimate, derived continuously from the companies' live data feeds.
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