Media Queries
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org
Please Support Us
We rely on donations to fund our work. Please support us if you can
Polluted by sewage 3,770 hours in 2025 , monitoring offline 1,581 hours , potential overflows 521 hours
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.
Your local MP is Sean Woodcock (Labour) - Find out more about their interests, donors, and voting at They Work For You
Please consider a one-off or small recurring donation. We need your help to keep this site going.
Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Offline/Potential Pollution |
|---|---|---|---|---|---|
| Thames Water | Hanwell STW | Hanwell Brook | 22 | 353h 15m | 702 h |
| Thames Water | Wardington SPS | River Cherwell | 46 | 327h 45m | - |
| Thames Water | Cropredy STW | River Cherwell | 20 | 267h | - |
| Thames Water | Shutford STW | Shutford Stream | 33 | 255h 45m | 463 h |
| Thames Water | Hook Norton STW | Hook Nortonbrook | 14 | 244h 30m | - |
| Thames Water | Bloxham STW | Bloxham Brook | 16 | 209h 30m | - |
| Thames Water | Banbury STW | River Cherwell | 13 | 207h | - |
| Thames Water | Chadlington STW | Chadlington Stream | 16 | 186h 45m | - |
| Thames Water | Chadlington STW | Chadlington Stream | 17 | 175h 30m | - |
| Thames Water | Chipping Norton STW | Blue Brook | 10 | 164h 15m | - |
| Thames Water | Bloxham STW | Bloxham Brook | 12 | 140h 15m | - |
| Thames Water | Horley (Oxon) STW | Sor Brook | 18 | 135h 30m | - |
| Thames Water | Hook Norton STW | Hook Nortonbrook | 10 | 128h | 8 h |
| Thames Water | Finstock STW | River Evenlode | 9 | 114h 45m | - |
| Thames Water | Middle Barton STW | River Dorn | 9 | 111h 15m | 49 h |
| Thames Water | Banbury STW | River Cherwell | 8 | 106h 30m | - |
| Thames Water | Cropredy STW | River Cherwell | 6 | 101h 15m | 406 h |
| Thames Water | Chipping Norton STW | Blue Brook | 8 | 94h 30m | - |
| Anglian Water | FRITWELL STW | Padbury Brook River Great Ouse | 4 | 51h 47m | - |
| Thames Water | Clifton STW | Clifton Brook | 8 | 50h 15m | - |
| Thames Water | Middle Barton STW | River Dorn | 5 | 42h 45m | - |
| Thames Water | The Mill (Kingham) SPS | Cornwell Brook | 7 | 42h 15m | - |
| Thames Water | Clifton STW | Clifton Brook | 6 | 38h 45m | 152 h |
| Thames Water | Charlbury STW | Evenlode | 5 | 35h 45m | - |
| Thames Water | The Mill (Kingham) SPS | Cornwell Brook | 9 | 35h | - |
| Thames Water | Finstock STW | River Evenlode | 3 | 32h 15m | - |
| Thames Water | Wardington SPS | River Cherwell | 12 | 30h | - |
| Thames Water | Horley (Oxon) STW | Sor Brook | 4 | 26h | 319 h |
| Thames Water | Hornton STW | Hornton Stream | 5 | 21h | - |
| Thames Water | Shutford STW | Shutford Stream | 6 | 17h 30m | - |
| Thames Water | Charlbury STW | Evenlode | 2 | 16h 15m | - |
| Thames Water | Hanwell STW | Hanwell Brook | 1 | 4h 45m | - |
| Thames Water | Cherwell Street (Banbury) SPS & SSP | River Cherwell | 2 | 2h 56m | - |
| Thames Water | Cherwell Street (Banbury) SPS & SSP | River Cherwell | 1 | 0h 24m | - |
| Thames Water | Fergusson road, banbury | Cherwell | 0 | 0h | - |
| Thames Water | Hornton STW | Hornton Stream | 0 | 0h | - |
| Anglian Water | FRITWELL STW | Padbury Brook River Great Ouse | 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
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.
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