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Polluted by sewage 9,400 hours in 2026 - That's 1.09 years so far..
What's a potential overflow? If the CSO goes 'Offline' while its Overflowing, we don't know if it stopped overflowing until we get a 'Stop' event.
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| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Offline/Potential Pollution |
|---|---|---|---|---|---|
| Thames Water | South Leigh STW | Limb Brook | 55 | 1,285 h | - |
| Thames Water | Church Hanborough STW | Hanborough Stream | 55 | 1,249 h 30m | - |
| Thames Water | Islip STW | River Ray | 49 | 1,080 h 15m | - |
| Thames Water | Weston-on-the-Green STW | Gallos Brook | 48 | 1,025 h 30m | - |
| Thames Water | Charlton-on-Otmoor STW | Oxon Ray | 48 | 1,005 h 15m | - |
| Thames Water | Woodstock STW | River Glyme | 46 | 815 h 30m | - |
| Thames Water | Combe STW | Evenlode | 33 | 584 h | - |
| Thames Water | Bicester STW | Langford Brook | 38 | 561 h 45m | - |
| Thames Water | Upper Heyford STW | Cherwell | 35 | 511 h 15m | - |
| Thames Water | Horton-Cum-Studley STW | Danes Brook | 32 | 509 h 15m | - |
| Thames Water | Bletchingdon STW | Bletchingdon Brook | 31 | 382 h 15m | - |
| Thames Water | Middleton Stoney STW | Gagle Brook | 26 | 255 h 30m | - |
| Thames Water | Tackley SPS & Storm SPS | Rver Cherwell | 20 | 123 h 30m | - |
| Anglian Water | WESTBURY STW | River Great Ouse | 4 | 11 h 42m | - |
| Thames Water | Woodstock STW | River Glyme | 0 | 0 h | - |
| Thames Water | Upper Heyford STW | Cherwell | 0 | 0 h | - |
| Thames Water | Weston-on-the-Green SPS | Gallos Brook | 0 | 0 h | - |
| Thames Water | Bicester STW | Langford Brook | 0 | 0 h | - |
| Thames Water | South Leigh STW | Limb Brook | 0 | 0 h | - |
| Thames Water | Combe STW | Evenlode | 0 | 0 h | - |
| Thames Water | Church Hanborough STW | Hanborough Stream | 0 | 0 h | - |
| Thames Water | Weston-on-the-Green SPS | Gallos Brook | 0 | 0 h | - |
| Thames Water | Bletchingdon STW | Bletchingdon Brook | 0 | 0 h | - |
| Thames Water | XX (Bucknell) SPS | Town Brook | 0 | 0 h | - |
| Anglian Water | ARDLEY STW | Stoke Lyne Brook | 0 | 0 h | - |
| Anglian Water | ARDLEY STW | Stoke Lyne Brook | 0 | 0 h | - |
| Thames Water | Middleton Stoney STW | Gagle Brook | 0 | 0 h | - |
| Thames Water | Charlton-on-Otmoor STW | Oxon Ray | 0 | 0 h | - |
| Thames Water | Weston-on-the-Green STW | Gallos Brook | 0 | 0 h | - |
| Anglian Water | WESTBURY STW | River Great Ouse | 0 | 0 h | - |
| Thames Water | Horton-Cum-Studley STW | Danes Brook | 0 | 0 h | - |
| Thames Water | Islip STW | River Ray | 0 | 0 h | - |
| Thames Water | XX (Bucknell) SPS | Town Brook | 0 | 0 h | - |
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