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Polluted by sewage 4,483 hours in 2025 , monitoring offline 243 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.
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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Offline/Potential Pollution |
|---|---|---|---|---|---|
| Anglian Water | BOXWORTH-HIGH ST TPS | Un Swavesey Dra | 41 | 629h 40m | - |
| Anglian Water | ELSWORTH-ROGERS CL SP | Elsworth Brook | 29 | 595h 32m | - |
| Anglian Water | OVER STW | Dockerell Brook River Great Ou | 29 | 590h 30m | - |
| Anglian Water | HARDWICK-WEST SP | Unnamed Culverted Watercourse | 27 | 575h 56m | - |
| Anglian Water | WARESLEY STW | Abbotsley Brook | 28 | 574h 8m | - |
| Anglian Water | GREAT GRANSDEN TPS | Gransden Brook | 30 | 551h 40m | - |
| Anglian Water | ABBOTSLEY-HARBINS LANE SP | Hen Brook | 26 | 519h 1m | - |
| Anglian Water | BOXWORTH-HIGH ST TPS | Un Swavesey Dra | 8 | 95h 23m | - |
| Anglian Water | ELSWORTH-ROGERS CL SP | Elsworth Brook | 7 | 88h 9m | - |
| Anglian Water | WARESLEY STW | Abbotsley Brook | 5 | 67h 32m | - |
| Anglian Water | OVER STW | Dockerell Brook River Great Ou | 3 | 46h 16m | - |
| Anglian Water | PAXTON STW | Paxton Brook | 4 | 33h 37m | - |
| Anglian Water | HARDWICK-WEST SP | Unnamed Culverted Watercourse | 3 | 32h 54m | 243 h |
| Anglian Water | PAXTON STW | Paxton Brook | 2 | 30h 15m | - |
| Anglian Water | GREAT GRANSDEN TPS | Gransden Brook | 3 | 16h 51m | - |
| Anglian Water | OVER-FEN ROAD SO SSO | Dockerel Brook | 2 | 14h 36m | - |
| Anglian Water | ABBOTSLEY-HARBINS LANE SP | Hen Brook | 2 | 13h 15m | - |
| Anglian Water | SWAVESEY-COW FEN SM | Unnamed River | 1 | 4h 29m | - |
| Anglian Water | ST NEOTS STW | River Ouse | 4 | 1h 59m | - |
| Anglian Water | PAPWORTH EVERARD STW | West Brook | 2 | 0h 35m | - |
| Anglian Water | St. Neots - Market Square CSO | River Great Ouse | 2 | 0h 23m | - |
| Anglian Water | OVER-FEN ROAD SO SSO | Dockerel Brook | 1 | 0h 15m | - |
| Anglian Water | PAPWORTH EVERARD STW | West Brook | 1 | 0h 14m | - |
| Anglian Water | Uttons Drove Water Recycling Centre | Swavesey Drain | 1 | 0h 14m | - |
| Anglian Water | ST NEOTS STW | River Ouse | 1 | 0h 10m | - |
| Anglian Water | CONINGTON-FEN DRAYTON RD SP | River Great Ouse | 0 | 0h | - |
| Anglian Water | SWAVESEY-COW FEN SM | Unnamed River | 0 | 0h | 0 h |
| Anglian Water | KNAPWELL-SP | Connington Brook | 0 | 0h | - |
| Anglian Water | KNAPWELL-SP | Connington Brook | 0 | 0h | - |
| Anglian Water | Uttons Drove Water Recycling Centre | Swavesey Drain | 0 | 0h | - |
| Anglian Water | St. Neots - Market Square CSO | 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