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Polluted by sewage 1,363 times in 2025 lasting 13,393 hours - That's 1.55 years!
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Donate NowHere are all the reported sewage overflow totals for Rhydaman 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 Marlais | CSO 6 NR BRYN MARLAIS FARM | 188 | 3,335 | 95.1 |
| Dwr Cymru Welsh Water | River Loughor | CSO 14/43 PONT Y CLERC Rd AMMANFORD | 135 | 1,996 | 99.9 |
| Dwr Cymru Welsh Water | River Amman | CSO 33 5M DOWNSTREAM OF PIPE BRIDGE | 128 | 1,782 | 99.9 |
| Dwr Cymru Welsh Water | River Marlas | McKays Crossing CSO | 114 | 1,458 | 97.1 |
| Dwr Cymru Welsh Water | River Marlais | 29 Aberlash Rd CSO, Llandybie | 61 | 871 | 99.4 |
| Dwr Cymru Welsh Water | River Loughor | CSO 16 PANTYFFYNON RAILWAY BRIDGE | 91 | 837 | 99.9 |
| Dwr Cymru Welsh Water | River Loughor | Combined Sewer Overflow 15 | 121 | 819 | 98.6 |
| Dwr Cymru Welsh Water | Nant Y Ci | CSO 9 10 METRES DOWNSTREAM - BRIDGE | 99 | 557 | 99.9 |
| Dwr Cymru Welsh Water | River Amman | CSO 37, Manhole 24B, Betws Rd Bridge | 91 | 489 | 99.2 |
| Dwr Cymru Welsh Water | River Loughor | PEN Y BANC CSO 40 ON HENDRE SEWER | 73 | 409 | 98.7 |
| Dwr Cymru Welsh Water | River Amman | CS0 34 100M DOWNSTREAM OF BRIDGE | 37 | 229 | 99.9 |
| Dwr Cymru Welsh Water | River Loughor | Penybanc Rd 2 CSO | 64 | 227 | 99 |
| Dwr Cymru Welsh Water | River Amman | CSO 36 Manhole 31c Opp Bettws Pk | 72 | 216 | 98.2 |
| Dwr Cymru Welsh Water | River Amman | CSO 38 500 M UP/STRM CONF LOUGHER | 59 | 120 | 99.9 |
| Dwr Cymru Welsh Water | River Loughor | Old NCB Yard CSO, Penybanc | 30 | 43 | 95.1 |
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