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Polluted by sewage 162 times in 2025 lasting 560 hours
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Donate NowHere are all the reported sewage overflow totals for Treherbert 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 | Rhondda Fawr River | Blaencwm Rd/Tydraw Terrace CSO | 74 | 268 | 99.1 |
| Dwr Cymru Welsh Water | Rhondda River | CSO at Rear of George Street, Treherbert | 73 | 267 | 97.7 |
| Dwr Cymru Welsh Water | Rhondda Fawr | Treherbert Bute/Corbett/David St Junction CSO | 5 | 15 | 99.8 |
| Dwr Cymru Welsh Water | River Rhondda Fawr | Treherbert Ind Est CSO Treherbert | 7 | 8 | 99.9 |
| Dwr Cymru Welsh Water | Nant Ystradffernol Via A Culvert | Blaen-y-Cwm Terrace CSO | 3 | 1 | 90.7 |
| Dwr Cymru Welsh Water | Rhondda River | Treherbert - Opposite Railway CSO | 0 | 0 | 100 |
| Dwr Cymru Welsh Water | Rhondda Fawr | Treherbert Pumping Station, Park Close | 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.
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