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Polluted by sewage 568 times in 2025 lasting 4,560 hours
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Donate NowHere are all the reported sewage overflow totals for Gorseinon 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 | Loughor Est'Y | LLANNANT WWTW LLANNANT ROAD SWANSEA | 122 | 2,061 | 99.9 |
| Dwr Cymru Welsh Water | River Lliw | Pont-y-cob Road CSO | 120 | 1,028 | 98.3 |
| Dwr Cymru Welsh Water | Loughor Estuary | GOWERTON WwTW | 49 | 361 | 99.9 |
| Dwr Cymru Welsh Water | River Lliw | Rhosog P.S | 61 | 333 | 99.9 |
| Dwr Cymru Welsh Water | Loughour Estuary | BEN HUGHES FOUNDRY CSO OPP REV JAME | 72 | 255 | 99.3 |
| Dwr Cymru Welsh Water | River Lliw | KINGSBRIDGE CSO GORSEINON SWANSEA | 58 | 210 | 99.9 |
| Dwr Cymru Welsh Water | River Lliw | CSO APX 70YDS U/S R'WAY B'GE U | 43 | 134 | 80.4 |
| Dwr Cymru Welsh Water | River Lliw | Gorseinon Factory CSO | 25 | 107 | 99.3 |
| Dwr Cymru Welsh Water | Unnamed Stream To Loughor Estu | CSO BRYNAFON ROAD GORSEINON SWANSEA | 12 | 65 | 99.8 |
| Dwr Cymru Welsh Water | Loughor Estuary Via Surface Water Sewer | HEOL PENTRE BACH CSO GORSEINON | 3 | 1 | 99.5 |
| Dwr Cymru Welsh Water | River Lliw | GORSEINON 2 S121 BAKO CSO GORSEINON | 2 | 1 | 99.5 |
| Dwr Cymru Welsh Water | Loughor Estuary Via Surface Water Sewer | Borough Road CSO Gorseinon Swansea | 1 | 0 | 99.2 |
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.
press [at] top-of-the-poops.org