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Polluted by sewage 1,013 times in 2025 lasting 5,990 hours
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Donate NowHere are all the reported sewage overflow totals for Pontypridd 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 Taff | CILFYNYDD STW CILFYNYDD PONTYPRID | 112 | 1,698 | 97.7 |
| Dwr Cymru Welsh Water | River Taff | Tonteg Road, Upper Boat CSO and Pumping Station Emergency Overflow | 119 | 851 | 99.9 |
| Dwr Cymru Welsh Water | River Taff | CYNON VALLEY STW GLYNCOCH PONTY | 64 | 778 | 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 Taff | Crossbrook St CSO, Pontypridd | 62 | 379 | 98.8 |
| Dwr Cymru Welsh Water | River Taff | Cilfynydd STW Cilfynydd Pontypridd Settled Storm | 20 | 329 | 99.8 |
| Dwr Cymru Welsh Water | Nant Clydach | Old Parish Road CSO, Ynysbwl | 83 | 253 | 98.3 |
| Dwr Cymru Welsh Water | River Taff | YNYSANGHARAD PARK CSO | 93 | 217 | 99.9 |
| Dwr Cymru Welsh Water | River Taff | Rhydfelin CSO Off Lionel Terrace | 32 | 154 | 99.9 |
| Dwr Cymru Welsh Water | River Taff | CASTLE INN CSO ASSET NO 32280 | 30 | 86 | 63.6 |
| Dwr Cymru Welsh Water | River Taff | Pontypridd West Street CSO | 63 | 52 | 99.2 |
| Dwr Cymru Welsh Water | Rhondda River | Pavia Courth CSO, Pontypridd | 44 | 47 | 99 |
| 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 | Nant Cae-Dudwg | End of Park Place CSO, Cilfynydd | 9 | 8 | 99.7 |
| Dwr Cymru Welsh Water | River Rhondda | Lanelay Crescent CSO, Maesycoed | 9 | 3 | 99.8 |
| Dwr Cymru Welsh Water | R Taff - Conf Rhondda R To Castle Street | CSO at Treforest Llantwit Rd A | 6 | 2 | 99.8 |
| Dwr Cymru Welsh Water | River Rhondda | Pwllgwaun Rd CSO, pontypridd | 5 | 1 | 99.9 |
| Dwr Cymru Welsh Water | Taff | Cardiff Road CSO, Pontypridd | 1 | 0 | 100 |
| Dwr Cymru Welsh Water | Nant Cae-Dudwg | PARK PLACE CSO | 0 | 0 | 99.9 |
| Dwr Cymru Welsh Water | River Taff | Sion Street Sewage Pumping Station | 0 | 0 | 99.9 |
| Dwr Cymru Welsh Water | River Taff | Taff St CSO, Pontypridd | 0 | 0 | 99.9 |
| Dwr Cymru Welsh Water | River Taff | YNYSANGHARAD HIGH LEVEL RELIEF CSO | 0 | 0 | 97.6 |
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.
press [at] top-of-the-poops.org