Polluted by sewage 6,465 hours in 2026 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 | Cropredy STW | River Cherwell | 53 | 1,083 h 30m | - |
| Thames Water | Hanwell STW | Hanwell Brook | 43 | 973 h 45m | - |
| Thames Water | Chadlington STW | Chadlington Stream | 44 | 839 h | - |
| Thames Water | Bloxham STW | Bloxham Brook | 40 | 768 h 30m | - |
| Thames Water | Wardington SPS | River Cherwell | 47 | 613 h 15m | - |
| Thames Water | Banbury STW | River Cherwell | 36 | 545 h | - |
| Thames Water | Chipping Norton STW | Blue Brook | 29 | 503 h 15m | - |
| Thames Water | Shutford STW | Shutford Stream | 26 | 304 h | - |
| Thames Water | Hook Norton STW | Hook Nortonbrook | 16 | 186 h 15m | - |
| Thames Water | Horley (Oxon) STW | Sor Brook | 21 | 184 h 30m | - |
| Thames Water | Middle Barton STW | River Dorn | 28 | 136 h 45m | - |
| Thames Water | The Mill (Kingham) SPS | Cornwell Brook | 19 | 112 h | - |
| Thames Water | Finstock STW | River Evenlode | 11 | 84 h 30m | - |
| Thames Water | Clifton STW | Clifton Brook | 11 | 68 h | - |
| Thames Water | Charlbury STW | Evenlode | 8 | 47 h 15m | - |
| Anglian Water | FRITWELL STW | Padbury Brook River Great Ouse | 2 | 16 h 21m | - |
| Thames Water | Cherwell Street (Banbury) SPS & SSP | River Cherwell | 0 | 0 h | - |
| Thames Water | Banbury STW | River Cherwell | 0 | 0 h | - |
| Thames Water | Fergusson road, banbury | Cherwell | 0 | 0 h | - |
| Thames Water | Chadlington STW | Chadlington Stream | 0 | 0 h | - |
| Thames Water | Wardington SPS | River Cherwell | 0 | 0 h | - |
| Thames Water | Cropredy STW | River Cherwell | 0 | 0 h | - |
| Thames Water | Hanwell STW | Hanwell Brook | 0 | 0 h | - |
| Thames Water | Bloxham STW | Bloxham Brook | 0 | 0 h | - |
| Thames Water | Charlbury STW | Evenlode | 0 | 0 h | - |
| Anglian Water | FRITWELL STW | Padbury Brook River Great Ouse | 0 | 0 h | - |
| Thames Water | Horley (Oxon) STW | Sor Brook | 0 | 0 h | - |
| Thames Water | Shutford STW | Shutford Stream | 0 | 0 h | - |
| Thames Water | The Mill (Kingham) SPS | Cornwell Brook | 0 | 0 h | - |
| Thames Water | Middle Barton STW | River Dorn | 0 | 0 h | - |
| Thames Water | Finstock STW | River Evenlode | 0 | 0 h | - |
| Thames Water | Chipping Norton STW | Blue Brook | 0 | 0 h | - |
| Thames Water | Clifton STW | Clifton Brook | 0 | 0 h | - |
| Thames Water | Hornton STW | Hornton Stream | 0 | 0 h | - |
| Thames Water | Hornton STW | Hornton Stream | 0 | 0 h | - |
| Thames Water | Hook Norton STW | Hook Nortonbrook | 0 | 0 h | - |
| Thames Water | Cherwell Street (Banbury) SPS & SSP | River Cherwell | 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.