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 1,264 hours in 2025
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 Laura Kyrke-Smith (Labour) - Find out more about their interests, donors, and voting at They Work For You
Thank you so much to everyone who contributed to the site in 2025 to keep it running. We do rely on
your contributions! Developing and running a website costs real money.
Please consider a one-off or small recurring donation.
| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Offline/Potential Pollution |
|---|---|---|---|---|---|
| Anglian Water | IVINGHOE ASTON STW | Coombe Bottom Brook, R Ouzel | 28 | 543 h 50m | - |
| Thames Water | Wingrave STW | Rowsham Brook | 30 | 183 h | - |
| Thames Water | Aylesbury STW | River Thame | 11 | 112 h | - |
| Thames Water | Wingrave STW | Rowsham Brook | 12 | 109 h 15m | - |
| Anglian Water | NORTHALL SP | River Ouzel | 10 | 55 h 20m | - |
| Anglian Water | IVINGHOE ASTON STW | Coombe Bottom Brook, R Ouzel | 11 | 42 h 21m | - |
| Anglian Water | IVINGHOE STW | Whistle Brook, River Ouzel | 17 | 39 h 2m | - |
| Thames Water | Dagnall STW | Groundwater Via Infilt System | 11 | 38 h 15m | - |
| Anglian Water | MENTMORE STW | Un River Ouzel | 3 | 24 h 17m | - |
| Thames Water | Aylesbury STW | River Thame | 3 | 23 h 15m | - |
| Anglian Water | MENTMORE STW | Un River Ouzel | 13 | 22 h 38m | - |
| Thames Water | Rowsham STW | Rowsham Brook | 7 | 21 h 30m | - |
| Thames Water | Dagnall STW | Groundwater Via Infilt System | 5 | 20 h 30m | - |
| Anglian Water | NORTHALL SP | River Ouzel | 1 | 7 h | - |
| Anglian Water | WING-CUBLINGTON ROAD STW | Wing Brook River Ouzel | 4 | 6 h 40m | - |
| Anglian Water | IVINGHOE STW | Whistle Brook, River Ouzel | 4 | 6 h 18m | - |
| Thames Water | Marsworth SPS | Thame | 1 | 5 h 45m | - |
| Thames Water | Marsworth SPS | Thame | 1 | 3 h 30m | - |
| Anglian Water | WING-CUBLINGTON ROAD STW | Wing Brook River Ouzel | 0 | 0 h | - |
| Thames Water | Rowsham STW | Rowsham 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