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Polluted by sewage 3,707 hours in 2025
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We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for Swansea West, here you can see overflows in red, the darker the red, the more the CSO overflowed that day.
Each CSO has a row, the most recent data is on the right hand side.
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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Total Duration (days) |
|---|---|---|---|---|---|
| Dwr Cymru Welsh Water | Llanllienwen Road Clydach Storm Overflow | Unnamed Tributary of Afon Tawe | 72 | 782 h 5m | 32.58 |
| Dwr Cymru Welsh Water | Off Somset Place Swansea Storm Overflow | Estuarial Waters of the River Tawe | 62 | 623 h 40m | 25.96 |
| Dwr Cymru Welsh Water | Clydach Road Side Street Storm Overflow | River Tawe | 77 | 616 h 37m | 25.67 |
| Dwr Cymru Welsh Water | Wychtree Street Beaufort Road Storm Overflow | River Tawe | 68 | 577 h 52m | 24.04 |
| Dwr Cymru Welsh Water | Ffordd Cwm Tawe Storm Overflow | River Tawe | 74 | 284 h 57m | 11.83 |
| Dwr Cymru Welsh Water | Cwmbwrla Roundabout Storm Overflow | Culvert of the Burlais Brook | 41 | 206 h 35m | 8.58 |
| Dwr Cymru Welsh Water | Heol Dyfan Swansea Overflow | River Tawe | 44 | 78 h 32m | 3.25 |
| Dwr Cymru Welsh Water | Crown Street Morriston Storm Overflow | The Nant Melyn | 44 | 77 h 27m | 3.21 |
| Dwr Cymru Welsh Water | Blaen Y Maes Drive Storm Overflow | Afon Llan | 32 | 75 h 3m | 3.12 |
| Dwr Cymru Welsh Water | Llangyfelach Road Car Park Storm Overflow | Cwm Gelli Stream | 39 | 63 h | 2.62 |
| Dwr Cymru Welsh Water | Junction of Cwm Level Road Storm Overflow | Culvert of the Cwm Gelli Stream | 21 | 59 h 56m | 2.46 |
| Dwr Cymru Welsh Water | Sandfields Storm Overflow | Estuarial Waters of Swansea Bay | 28 | 56 h 26m | 2.33 |
| Dwr Cymru Welsh Water | Swansea Penlan Terrace Storm Overflow | Nant Cwmgelli | 30 | 40 h 6m | 1.67 |
| Dwr Cymru Welsh Water | Cwm Road Swansea Storm Overflow | Culvert of the Burlais Brook | 34 | 35 h 35m | 1.46 |
| Dwr Cymru Welsh Water | Skomer Place Storm Overflow | Afon Llan | 19 | 30 h 22m | 1.25 |
| Dwr Cymru Welsh Water | Mynydd Garn Lwyd Road Swansea Storm Overflow | Nant Cwmgelli | 23 | 23 h 54m | 0.96 |
| Dwr Cymru Welsh Water | Sketty Park Drive Storm Overflow | Unnamed Tributary of the River Clyne | 11 | 19 h 1m | 0.79 |
| Dwr Cymru Welsh Water | Furzeland Drive Sketty Storm Overflow | Culverted section of an Unnamed Tributary of the River Clyne | 17 | 16 h 40m | 0.67 |
| Dwr Cymru Welsh Water | Mynydd Newydd Road Junciton with Heol Gwyrosydd Storm Overflow | Afon Llan | 6 | 9 h 7m | 0.38 |
| Dwr Cymru Welsh Water | Cadle Common Storm Overflow | Unnamed Tributary of Afon Llan | 2 | 5 h 28m | 0.21 |
| Dwr Cymru Welsh Water | Ffordd Y Brain Swansea Storm Overflow | Unnamed Tributary of Afon Llan | 4 | 4 h 14m | 0.17 |
| Dwr Cymru Welsh Water | Pentrepoeth Road Storm Overflow | Cwmrhydyceirw Brook | 11 | 3 h 45m | 0.12 |
| Dwr Cymru Welsh Water | Glanowen Road Overflow | River Tawe | 5 | 2 h 43m | 0.08 |
| Dwr Cymru Welsh Water | Cadlewood Road Storm Overflow | Afon Llan | 7 | 2 h 42m | 0.08 |
| Dwr Cymru Welsh Water | Westbury Street Storm Overflow | River Tawe | 7 | 1 h 45m | 0.04 |
| Dwr Cymru Welsh Water | Swansea between Camarthen Road & Gors Avenue Storm Overflow | Culvert of the Burlais Brook | 3 | 1 h 29m | 0.04 |
| Dwr Cymru Welsh Water | Sketty Green Storm Overflow | Swansea Bay | 3 | 1 h 26m | 0.04 |
| Dwr Cymru Welsh Water | Singleton Park Storm Overflow | Brynmill Stream | 2 | 1 h 17m | 0.04 |
| Dwr Cymru Welsh Water | Slate Street junciton with Margam Avenue Storm Overflow | The Nant Melyn | 4 | 1 h 15m | 0.04 |
| Dwr Cymru Welsh Water | Eaton Road Swansea Overflow | River Tawe | 2 | 1 h 15m | 0.04 |
| Dwr Cymru Welsh Water | Oakwood Road Swansea Storm Overflow | Brynmill Stream | 1 | 1 h 14m | 0.04 |
| Dwr Cymru Welsh Water | Byng Morris Close Sketty Storm Overflow | Tributary of the River Clyne | 2 | 0 h 44m | 0 |
| Dwr Cymru Welsh Water | Bryn Road and Gorse Lane Swansea Storm Overflow | Swansea Bay | 2 | 0 h 30m | 0 |
| Dwr Cymru Welsh Water | Chemical Road junction of Sway Road Storm Overflow | Unnamed Tributary of Afon Taf | 1 | 0 h 15m | 0 |
| Dwr Cymru Welsh Water | Swansea Penlan Fach Storm Overflow | Cwm Gelli Stream | 1 | 0 h 15m | 0 |
| Dwr Cymru Welsh Water | Cwm Bath Road Storm Overflow | Nant Melyn | 1 | 0 h 14m | 0 |
| Dwr Cymru Welsh Water | Brynymor Road Storm Overflow | Swansea Bay | 0 | 0 h | 0 |
| Dwr Cymru Welsh Water | Heol Nant Gelli Storm Overflow | Cwm Gelli Stream, Tributary of the Afon Tawe | 0 | 0 h | 0 |
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