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Here are all the reported sewage overflow totals for River Rhymney 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 | River Rhymney | A CSO 700M SE OF PLAS MACHEN COTAGE | 102 | 1,509 | 85.7 |
| Dwr Cymru Welsh Water | River Rhymney | CSO at Glan-yr-Afon Nursing Home No2, Pengam | 110 | 1,203 | 98.9 |
| Dwr Cymru Welsh Water | River Rhymney | CWM LAS CSO | 82 | 864 | 98.6 |
| Dwr Cymru Welsh Water | River Rhymney | Abertysswg Rugby Playing Field CSO | 92 | 793 | 99 |
| Dwr Cymru Welsh Water | River Rhymney | Tredomen AFC CSO, Ystrad Mynach | 72 | 582 | 99.9 |
| Dwr Cymru Welsh Water | River Rhymney | A CSO AT PONTLOTTYN | 89 | 572 | 99.9 |
| Dwr Cymru Welsh Water | River Rhymney | CSO At New Tredegar Adj Rhosyn Gwyn | 38 | 440 | 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 Rhymney | CSO at Glan-yr-Afon Nursing Home 1 | 69 | 253 | 100 |
| Dwr Cymru Welsh Water | River Rhymney | CSO NEAR RHYMNEY STATION | 58 | 244 | 99.2 |
| Dwr Cymru Welsh Water | River Rhymney | BEDWAS SUNNYBANK FARM CSO | 45 | 225 | 98.9 |
| Dwr Cymru Welsh Water | River Rhymney | CSO at Pengham High St near Bridge | 49 | 206 | 100 |
| Dwr Cymru Welsh Water | River Rhymney | Tir-y-Berth behind William St | 63 | 192 | 99.2 |
| Dwr Cymru Welsh Water | River Rhymney | CSO AT REAR OF MEMORIAL HOSPITAL | 58 | 188 | 99 |
| Dwr Cymru Welsh Water | River Rhymney | A CSO AT YSTRAD MYNACH BRIDGE | 57 | 178 | 98.1 |
| Dwr Cymru Welsh Water | River Rhymney | Rhymney Carno St Bute House CSO | 48 | 144 | 99.2 |
| Dwr Cymru Welsh Water | River Rhymney | TRELYN LANE CSO FLEUR-DE-LIS | 37 | 130 | 99.8 |
| Dwr Cymru Welsh Water | River Rhymney | CSO BARGOED | 55 | 101 | 99.9 |
| Dwr Cymru Welsh Water | River Rhymney | CSO Nr Bethania Cottages | 54 | 99 | 69.5 |
| Dwr Cymru Welsh Water | River Rhymney | Forge Engineering CSO, Bedwas | 24 | 67 | 97.4 |
| Dwr Cymru Welsh Water | River Rhymney | CSO Opposite Bowen Ind Estate, Aberbargoed | 36 | 60 | 99.7 |
| Dwr Cymru Welsh Water | River Rhymney | CSO at rear of Margaret St., Gilfach | 24 | 44 | 96.9 |
| Dwr Cymru Welsh Water | River Rhymney | CSO ASSET NO 90411 PENGAM | 40 | 36 | 96.9 |
| Dwr Cymru Welsh Water | River Rhymney | Asset No. 32207 Celtic Steel Factory CSO | 17 | 27 | 99.6 |
| Dwr Cymru Welsh Water | River Rhymney | High St CSO, Glan-y-Nant | 12 | 18 | 99.8 |
| Dwr Cymru Welsh Water | River Rhymney | Fishponds Road No22 CSO, Llanrumey | 10 | 14 | 99.9 |
| Dwr Cymru Welsh Water | River Rhymney | Newport Rd CSO, Trethomas | 6 | 7 | 99.4 |
| Dwr Cymru Welsh Water | River Rhymney | Forge Rd CSO, Machen | 8 | 6 | 90.3 |
| Dwr Cymru Welsh Water | River Rhymney | A CSO AT BIRTHDIR NEAR STATION | 3 | 5 | 99.9 |
| Dwr Cymru Welsh Water | River Rhymney | Rumney Hill CSO | 4 | 5 | 100 |
| Dwr Cymru Welsh Water | River Rhymney | CSO at Trelyn Park | 4 | 1 | 99.9 |
| Dwr Cymru Welsh Water | River Rhymney | CSO at Bridge Road, St Mellons, Cardiff | 1 | 0 | 97.2 |
| Dwr Cymru Welsh Water | River Rhymney | Aberbargoed CSO | 0 | 0 | 96.3 |
| Dwr Cymru Welsh Water | River Rhymney | COMBINED SEWER OVERFLOW SERVING | 0 | 0 | 99.9 |
| Dwr Cymru Welsh Water | River Rhymney | OLD PRINCE ALBERT HOTEL HENGOED | 0 | 0 | 100 |
| Dwr Cymru Welsh Water | River Rhymney | Rear of Williams St CSO | 0 | 0 | 100 |
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