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Polluted by sewage 450 times in 2025 lasting 2,200 hours
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Donate NowHere are all the reported sewage overflow totals for Llanelli 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 Estuary | LLANELLI WWTW BERWICK ROAD BYNEA | 49 | 368 | 99.9 |
| Dwr Cymru Welsh Water | River Dafen | St Michael’s Church CSO | 32 | 343 | 99.6 |
| Dwr Cymru Welsh Water | River Dafen | East of Kingfisher Court CSO | 36 | 326 | 99.8 |
| Dwr Cymru Welsh Water | Loughour Estuary | BEN HUGHES FOUNDRY CSO OPP REV JAME | 72 | 255 | 99.3 |
| Dwr Cymru Welsh Water | River Dulais | SANDY SPS (A484 o/s gate to Sandy PS) | 53 | 173 | 99.9 |
| Dwr Cymru Welsh Water | River Dafen | CSO at Heol Cropin SPS | 17 | 166 | 99.9 |
| Dwr Cymru Welsh Water | River Loughor Estuary | PWLL SEWAGE PUMPING STATION CARMS | 15 | 160 | 96.9 |
| Dwr Cymru Welsh Water | River Loughor Estuary | SSO. NORTHUMBERLAND OUTFALL | 29 | 90 | 99.9 |
| Dwr Cymru Welsh Water | River Dulais | YARD BRIDGE CSO SANDY RD PWLL LLAN | 20 | 80 | 99.6 |
| Dwr Cymru Welsh Water | Tidal Pill Of Loughor Estuary | Bynea Sewage pumping Station | 15 | 72 | 99.9 |
| Dwr Cymru Welsh Water | Pîl Dafen | CSO 49 Tir Einon, Llwynhendy | 24 | 57 | 96.9 |
| Dwr Cymru Welsh Water | River Lliedi | Llanelli - Head Post Office CSO | 27 | 39 | 81.5 |
| Dwr Cymru Welsh Water | River Lliedi | CSO BELOW ANDREW STREET BRIDGE LLAN | 6 | 20 | 80 |
| Dwr Cymru Welsh Water | Loughor Outer | Cambrian Street P.S. SSO | 13 | 18 | 99.9 |
| Dwr Cymru Welsh Water | River Dafen | Havard Road CSO | 17 | 11 | 99.2 |
| Dwr Cymru Welsh Water | Of River Dafen | LLWYNUHILWG PS EMERG , , | 2 | 6 | 99.8 |
| Dwr Cymru Welsh Water | River Lliedi | SWO.BELOW PENYFAN QUARRY(S158) LLAN | 14 | 6 | 99.5 |
| Dwr Cymru Welsh Water | River Dafen | HALFWAY PS DAFEN LLANELLI CARMS | 4 | 1 | 99.8 |
| Dwr Cymru Welsh Water | River Lliedi | HEOL GOFFA ROAD CSO LLANELLI CARMS | 1 | 1 | 100 |
| Dwr Cymru Welsh Water | River Dafen | Halfway Area CSO, Y Llwyn, Coedcae | 2 | 0 | 100 |
| Dwr Cymru Welsh Water | River Dafen Via Surface Water Culvert | Pencae Terrace CSO | 1 | 0 | 96.1 |
| Dwr Cymru Welsh Water | Surf W System To River Dafen | ST GEORGE COTTAGES CSO COEDCAE | 1 | 0 | 100 |
| Dwr Cymru Welsh Water | River Lliedi | BUCKLEYS CELLAR CSO LLANELLI | 0 | 0 | 96.9 |
| Dwr Cymru Welsh Water | River Lliedi | CSO at 52 Maestir, Llanelli | 0 | 0 | 85.9 |
| Dwr Cymru Welsh Water | Un | HEOL HEN CSO LLWYNHENDY LLANELLI | 0 | 0 | 91.1 |
| Dwr Cymru Welsh Water | River Lliedi | Llanelli - O/S Thomas Brothers 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
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.
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Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org