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Polluted by sewage 269 hours in 2026 , monitoring offline 48 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 |
|---|---|---|---|---|---|
| Anglian Water | DOWNHAM MARKET STW | Flood Relief Channel | 14 | 92h 36m | - |
| Anglian Water | SWAFFHAM STW | River Wissey | 20 | 87h 31m | - |
| Anglian Water | DOWNHAM MARKET-RAILWAY SSO | Flood Relief Channel Sur W Sew | 37 | 52h 10m | - |
| Anglian Water | NARBOROUGH STW | Ketlam Drain River Nar | 5 | 21h 59m | - |
| Anglian Water | SOUTHERY-MILL DROVE STW | White Bridge Drain River Great | 6 | 11h 32m | - |
| Anglian Water | Mundford WRC | River Wissey | 2 | 2h 8m | - |
| Anglian Water | DOWNHAM MARKET-DENIS SNZM SSO | Un Relief Chann | 3 | 1h | - |
| Anglian Water | DOWNHAM MKT-LYNN ROAD OV | Relief Ch | 1 | 0h 15m | - |
| Anglian Water | STOKE FERRY STW | Red Gate Drain | 1 | 0h 13m | - |
| Anglian Water | DOWNHAM MARKET-THE HYTHE SP | Relief Channel | 1 | 0h 10m | - |
| Anglian Water | NARBOROUGH STW | Ketlam Drain River Nar | 0 | 0h | - |
| Anglian Water | DOWNHAM MARKET STW | Flood Relief Channel | 0 | 0h | - |
| Anglian Water | THETFORD-HAYLING PATH SP | River Little Ouse | 0 | 0h | - |
| Anglian Water | DOWNHAM MARKET STW | Flood Relief Channel | 0 | 0h | - |
| Anglian Water | Thetford WRC | River Little Ouse | 0 | 0h | - |
| Anglian Water | DOWNHAM MARKET-DENIS SNZM SSO | Un Relief Chann | 0 | 0h | - |
| Anglian Water | SOUTHERY-LITTLE LONDON SP | Whitebridge Drain | 0 | 0h | - |
| Anglian Water | FELTWELL STW | Cut-Off Channel | 0 | 0h | - |
| Anglian Water | SOUTHERY-MILL DROVE STW | White Bridge Drain River Great | 0 | 0h | - |
| Anglian Water | DOWNHAM MARKET STW | Flood Relief Channel | 0 | 0h | - |
| Anglian Water | THETFORD-HAYLING PATH SP | River Little Ouse | 0 | 0h | - |
| Anglian Water | FELTWELL STW | Cut-Off Channel | 0 | 0h | - |
| Anglian Water | DOWNHAM MARKET-RAILWAY SSO | Flood Relief Channel Sur W Sew | 0 | 0h | - |
| Anglian Water | SWAFFHAM STW | River Wissey | 0 | 0h | - |
| Anglian Water | WATTON STW | Watton Brook | 0 | 0h | 48 h |
| Anglian Water | Thetford WRC | River Little Ouse | 0 | 0h | - |
| Anglian Water | DOWNHAM MKT-LYNN ROAD OV | Relief Ch | 0 | 0h | - |
| Anglian Water | Thetford WRC | River Little Ouse | 0 | 0h | - |
| Anglian Water | Thetford WRC | River Little Ouse | 0 | 0h | - |
| Anglian Water | WATTON STW | Watton Brook | 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