Media Queries
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org
Please Support Us
We rely on donations to fund our work. Please support us if you can
Polluted by sewage 456 times in 2025 lasting 4,099 hours
Please consider a one-off or small recurring donation. We need your help to keep this site going.
Donate NowHere are all the reported sewage overflow totals for Caerdydd Ffynnon Taf 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 constituency 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 | Severn Estuary | Kimberley Road CSO | 117 | 1,906 | 98.5 |
| Dwr Cymru Welsh Water | River Taff | Tongwynlais CSO | 69 | 1,222 | 99.9 |
| Dwr Cymru Welsh Water | River Rhymney | Storm Water Overflow at Began, St Mellons | 93 | 412 | 96.7 |
| Dwr Cymru Welsh Water | River Rhymney | Ball Lane CSO | 45 | 280 | 99.9 |
| Dwr Cymru Welsh Water | River Taff | Ynys Bridge CSO | 32 | 155 | 98.6 |
| Dwr Cymru Welsh Water | Nant-Y-Wedal | HEATHWOOD ROAD CSO, HEATHWOOD JUNCTION | 27 | 27 | 92.8 |
| Dwr Cymru Welsh Water | Rhydwaedlyd Brook | Caedelyn Park Boundary CSO | 26 | 26 | 99.8 |
| Dwr Cymru Welsh Water | Rhymney River | Began Road CSO | 10 | 24 | 99.5 |
| Dwr Cymru Welsh Water | River Taff Via Culverted Watercourse | ABERPORTH RD CSO | 9 | 17 | 91.9 |
| Dwr Cymru Welsh Water | River Rhymney | Fishponds Road No22 CSO, Llanrumey | 10 | 14 | 99.9 |
| Dwr Cymru Welsh Water | Taff | Bottom of Westbourne Crescent CSO, Cardiff | 13 | 8 | 99.6 |
| Dwr Cymru Welsh Water | River Rhymney | Rumney Hill CSO | 4 | 5 | 100 |
| Dwr Cymru Welsh Water | River Rhymney | CSO at Bridge Road, St Mellons, Cardiff | 1 | 0 | 97.2 |
| Dwr Cymru Welsh Water | Rhymney River | Hartland Road PS | 0 | 0 | 99.9 |
| Dwr Cymru Welsh Water | Roath Brook | Kimberly Road CSO | 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.
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