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Here are all the reported sewage overflow totals for River Rhondda in 2025. Sometimes sewage can be being dumped for months at a time.
| Company | Waterway | Site | Sewage Dumps | Duration (Hours) | Reporting % |
|---|---|---|---|---|---|
| Dwr Cymru Welsh Water | River Rhondda | Brook Street Combined Sewer Overflow | 149 | 1,099 | 99.9 |
| Dwr Cymru Welsh Water | River Rhondda | A COMBINED SEWER OVERFLOW GYFEILLON | 132 | 657 | 99.9 |
| Dwr Cymru Welsh Water | River Rhondda | CSO at Pwllgwuan Syphons, Millfield, Pontypridd | 92 | 419 | 98.8 |
| Dwr Cymru Welsh Water | River Rhondda | A Combined Sewer Overflow, Trehafod | 13 | 152 | 94.5 |
| Dwr Cymru Welsh Water | River Rhondda | Llwynypia Rd CSO, Tonypandy | 73 | 105 | 99.1 |
| Dwr Cymru Welsh Water | River Rhondda | CSO AT CADWGAN TERRACE TREHAFOD | 16 | 41 | 99.9 |
| Dwr Cymru Welsh Water | River Rhondda | Trehafod Pumping Station | 51 | 39 | 99.9 |
| Dwr Cymru Welsh Water | River Rhondda | Herbert St CSO | 16 | 29 | 99.3 |
| Dwr Cymru Welsh Water | River Rhondda | Lower Mill Street CSO Pontypridd | 14 | 28 | 88 |
| Dwr Cymru Welsh Water | River Rhondda | Pellgwaun CSO | 23 | 23 | 98.2 |
| Dwr Cymru Welsh Water | River Rhondda | River Terrace CSO, Treorchy, Rhondda | 23 | 10 | 99.9 |
| Dwr Cymru Welsh Water | River Rhondda | Lanelay Crescent CSO, Maesycoed | 9 | 3 | 99.8 |
| Dwr Cymru Welsh Water | River Rhondda | Pwllgwaun Rd CSO, pontypridd | 5 | 1 | 99.9 |
| Dwr Cymru Welsh Water | River Rhondda | Cymmer Rd CSO, Porth | 4 | 1 | 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.
This project is not associated, approved or endorsed by any of the companies whose logos you see here.
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org