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Here are all the reported sewage overflow totals for Nant Clydach 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 | Nant Clydach | A CSO at Clydach Vale Davies Street | 122 | 709 | 98.9 |
| Dwr Cymru Welsh Water | Nant Clydach | Tank Near Pit CSO Ynysybwl | 90 | 553 | 89.7 |
| Dwr Cymru Welsh Water | Nant Clydach | GLYN STREET CSO GLYN ST YNYSYBWL | 98 | 521 | 99.3 |
| Dwr Cymru Welsh Water | Nant Clydach | Old Parish Road CSO, Ynysbwl | 83 | 253 | 98.3 |
| Dwr Cymru Welsh Water | Nant Clydach | CSO at Clydach Rd, Ynysbwl | 47 | 228 | 99.3 |
| Dwr Cymru Welsh Water | Nant Clydach | Railway Terrace CSO, Clydach Vale | 60 | 166 | 97.1 |
| Dwr Cymru Welsh Water | Nant Clydach | CSO O/S 2 Clydach Terrace, Ynysybwl | 34 | 88 | 80.2 |
| Dwr Cymru Welsh Water | Nant Clydach | CSO at Tonypandy, Rear of De Winton St | 11 | 17 | 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
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.
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