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Here are all the reported sewage overflow totals for Severn Estuary 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 | Severn Estuary | RHYMNEY VALLEY TRUNK SEWER CSO | 140 | 2,262 | 99.9 |
| Dwr Cymru Welsh Water | Severn Estuary | Kimberley Road CSO | 117 | 1,906 | 98.5 |
| Dwr Cymru Welsh Water | Severn Estuary | WESTERN VALLEY TRUNK SEWER CSO | 59 | 1,319 | 99.8 |
| Dwr Cymru Welsh Water | Severn Estuary | CARDIFF CENTRAL SPS TREMORFA | 84 | 384 | 96.8 |
| Dwr Cymru Welsh Water | Severn Estuary | LLANTWIT MAJOR WWTW (STW) WICK ROAD | 37 | 246 | 99.95 |
| Dwr Cymru Welsh Water | Severn Estuary | PENARTH HEAD SEWAGE PUMPING STATION | 51 | 211 | 99.9 |
| Dwr Cymru Welsh Water | Severn Estuary | Settled Storm Overflow at Cardiff Eastern District Pumping Station | 41 | 144 | 99.8 |
| Dwr Cymru Welsh Water | Severn Estuary | Penarth Marina SPS | 8 | 90 | 99.5 |
| Dwr Cymru Welsh Water | Severn Estuary | BROCKHILL RISE & LAVERNOCK RD SSO'S | 29 | 84 | 91.9 |
| Dwr Cymru Welsh Water | Severn Estuary | KYMIN PS PENARTH CARDIFF , | 40 | 78 | 99.4 |
| Dwr Cymru Welsh Water | Severn Estuary | CARDIFF EAST DISTRICT LONG OUTFALL | 41 | 41 | 99.8 |
| Dwr Cymru Welsh Water | Severn Estuary | OCEAN PARK PS TREMORFA FORESHORE RO | 2 | 2 | 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