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Polluted by sewage 579 times in 2025 lasting 3,611 hours
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Donate NowHere are all the reported sewage overflow totals for Treorci 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 River Fawr | REGENT ST CSO TREORCHY RHONDDA | 154 | 2,155 | 99.9 |
| Dwr Cymru Welsh Water | Rhondda Fawr | Ton Pentre PS CSOTont Pentre RCT | 128 | 779 | 99.6 |
| Dwr Cymru Welsh Water | River Rhondda Fawr | CSO at Junct Ystrad/Church Road Ystrad | 125 | 281 | 93.1 |
| Dwr Cymru Welsh Water | Rhondda River | CSO at Rear of George Street, Treherbert | 73 | 267 | 97.7 |
| Dwr Cymru Welsh Water | Rhondda Fawr | CSO to rear of 8 Griffin Park | 13 | 40 | 62 |
| Dwr Cymru Welsh Water | River Rhondda | Herbert St CSO | 16 | 29 | 99.3 |
| Dwr Cymru Welsh Water | Rhondda Fawr | Treherbert Bute/Corbett/David St Junction CSO | 5 | 15 | 99.8 |
| Dwr Cymru Welsh Water | Rhondda Fach | Cwmparc Railway Terrace CSO | 15 | 13 | 99.7 |
| Dwr Cymru Welsh Water | River Rhondda | River Terrace CSO, Treorchy, Rhondda | 23 | 10 | 99.9 |
| Dwr Cymru Welsh Water | River Rhondda Fawr | Treherbert Ind Est CSO Treherbert | 7 | 8 | 99.9 |
| Dwr Cymru Welsh Water | River Rhondda Fawr | LEWIS STREET CSO & PUMPING STATION | 8 | 5 | 99.9 |
| Dwr Cymru Welsh Water | River Cynon | Pentre - Llewellyn Street CSO | 6 | 2 | 99.6 |
| Dwr Cymru Welsh Water | Rhondda Fawr | ELISABETH CLOSE CSO PENTRE RCT | 2 | 1 | 99.9 |
| Dwr Cymru Welsh Water | Nant Cymparc | Junction of Sunnyhill & Park Crescent CSO, Cwmparc | 3 | 0 | 99.3 |
| Dwr Cymru Welsh Water | Rhondda Fawr River | 2 Clarence St CSO, Pentre | 1 | 0 | 98.7 |
| Dwr Cymru Welsh Water | Rhonda Fawr River | TREORCHY CSO - M/H AT SIDE OF BOYS | 0 | 0 | 100 |
| 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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