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Polluted by sewage 6,775 hours in 2026 , monitoring offline 359 hours 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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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Offline/Potential Pollution |
|---|---|---|---|---|---|
| Thames Water | Hanwell STW | Hanwell Brook | 53 | 1,151h | - |
| Thames Water | Cropredy STW | River Cherwell | 57 | 1,115h | - |
| Thames Water | Chadlington STW | Chadlington Stream | 45 | 839h 30m | - |
| Thames Water | Bloxham STW | Bloxham Brook | 51 | 784h 30m | 359 h |
| Thames Water | Wardington SPS | River Cherwell | 57 | 667h | - |
| Thames Water | Banbury STW | River Cherwell | 36 | 545h | - |
| Thames Water | Chipping Norton STW | Blue Brook | 29 | 503h 15m | - |
| Thames Water | Shutford STW | Shutford Stream | 30 | 317h 15m | - |
| Thames Water | Hook Norton STW | Hook Nortonbrook | 16 | 186h 15m | - |
| Thames Water | Horley (Oxon) STW | Sor Brook | 23 | 185h 45m | - |
| Thames Water | Middle Barton STW | River Dorn | 28 | 136h 45m | - |
| Thames Water | The Mill (Kingham) SPS | Cornwell Brook | 19 | 112h | - |
| Thames Water | Finstock STW | River Evenlode | 11 | 84h 30m | - |
| Thames Water | Clifton STW | Clifton Brook | 11 | 68h | - |
| Thames Water | Charlbury STW | Evenlode | 8 | 47h 15m | - |
| Anglian Water | FRITWELL STW | Padbury Brook River Great Ouse | 4 | 17h 22m | - |
| Thames Water | Hornton STW | Hornton Stream | 1 | 15h | - |
| Thames Water | Cherwell Street (Banbury) SPS & SSP | River Cherwell | 0 | 0h | - |
| Thames Water | Banbury STW | River Cherwell | 0 | 0h | - |
| Thames Water | Fergusson road, banbury | Cherwell | 0 | 0h | - |
| Thames Water | Chadlington STW | Chadlington Stream | 0 | 0h | - |
| Thames Water | Wardington SPS | River Cherwell | 0 | 0h | - |
| Thames Water | Cropredy STW | River Cherwell | 0 | 0h | - |
| Thames Water | Hanwell STW | Hanwell Brook | 0 | 0h | - |
| Thames Water | Bloxham STW | Bloxham Brook | 0 | 0h | - |
| Thames Water | Charlbury STW | Evenlode | 0 | 0h | - |
| Anglian Water | FRITWELL STW | Padbury Brook River Great Ouse | 0 | 0h | - |
| Thames Water | Horley (Oxon) STW | Sor Brook | 0 | 0h | - |
| Thames Water | Shutford STW | Shutford Stream | 0 | 0h | - |
| Thames Water | The Mill (Kingham) SPS | Cornwell Brook | 0 | 0h | - |
| Thames Water | Middle Barton STW | River Dorn | 0 | 0h | - |
| Thames Water | Finstock STW | River Evenlode | 0 | 0h | - |
| Thames Water | Chipping Norton STW | Blue Brook | 0 | 0h | - |
| Thames Water | Clifton STW | Clifton Brook | 0 | 0h | - |
| Thames Water | Hornton STW | Hornton Stream | 0 | 0h | - |
| Thames Water | Hook Norton STW | Hook Nortonbrook | 0 | 0h | - |
| Thames Water | Cherwell Street (Banbury) SPS & SSP | River Cherwell | 0 | 0h | - |
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