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Polluted by sewage 540 times in 2025 lasting 3,480 hours
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Donate NowHere are all the reported sewage overflow totals for Cas-Gwent 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 Wye Estuary | Chepstow South SPS Hunger Pill STW | 110 | 1,439 | 99.9 |
| Dwr Cymru Welsh Water | River Wye | CSO at Welsh Street Chepstow | 130 | 1,054 | 99.9 |
| Dwr Cymru Welsh Water | River Wye | SEDBURY SEWAGE PUMPING STATION | 59 | 332 | 99.9 |
| Dwr Cymru Welsh Water | River Wye Estuary | Chepstow North Fairfield SPS | 75 | 332 | 99.9 |
| Dwr Cymru Welsh Water | Mounton Brook | Mathern SPS | 17 | 142 | 99.9 |
| Dwr Cymru Welsh Water | River Wye Estuary | Chepstow North SPS The Back | 59 | 72 | 99.9 |
| Dwr Cymru Welsh Water | River Wye | Thornwell Road CSO | 49 | 63 | 99.9 |
| Dwr Cymru Welsh Water | River Wye | WYEBANK RD CSO | 28 | 29 | 78.9 |
| Dwr Cymru Welsh Water | Rivr Wye | WARREN SLADE SEWAGE PUMPING STATION | 1 | 7 | 99.9 |
| Dwr Cymru Welsh Water | River Wye | Raglan Way CSO | 12 | 7 | 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.
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Get in touch if you have queries or want to discuss our data.
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