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Polluted by sewage 1,963 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.
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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Offline/Potential Pollution |
|---|---|---|---|---|---|
| Anglian Water | DOWNHAM MARKET-RAILWAY SSO | Flood Relief Channel Sur W Sew | 60 | 572h 59m | - |
| Anglian Water | DOWNHAM MARKET STW | Flood Relief Channel | 27 | 551h 14m | - |
| Anglian Water | SWAFFHAM STW | River Wissey | 41 | 544h 8m | - |
| Anglian Water | DOWNHAM MARKET STW | Flood Relief Channel | 8 | 94h 48m | - |
| Anglian Water | FELTWELL STW | Cut-Off Channel | 11 | 47h | - |
| Anglian Water | DOWNHAM MARKET STW | Flood Relief Channel | 2 | 33h 22m | - |
| Anglian Water | DOWNHAM MARKET-RAILWAY SSO | Flood Relief Channel Sur W Sew | 13 | 30h 24m | - |
| Anglian Water | WATTON STW | Watton Brook | 3 | 26h 59m | - |
| Anglian Water | NARBOROUGH STW | Ketlam Drain River Nar | 3 | 26h 44m | - |
| Anglian Water | SWAFFHAM STW | River Wissey | 7 | 20h 26m | - |
| Anglian Water | SOUTHERY-MILL DROVE STW | White Bridge Drain River Great | 4 | 11h 45m | - |
| Anglian Water | NARBOROUGH STW | Ketlam Drain River Nar | 1 | 2h | - |
| Anglian Water | SOUTHERY-MILL DROVE STW | White Bridge Drain River Great | 2 | 0h 57m | - |
| Anglian Water | THETFORD-HAYLING PATH SP | River Little Ouse | 1 | 0h 17m | - |
| Anglian Water | DOWNHAM MARKET-DENIS SNZM SSO | Un Relief Chann | 1 | 0h 3m | - |
| Anglian Water | DOWNHAM MARKET-DENIS SNZM SSO | Un Relief Chann | 0 | 0h | - |
| Anglian Water | STOKE FERRY STW | Red Gate Drain | 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 | Thetford WRC | River Little Ouse | 0 | 0h | - |
| Anglian Water | SOUTHERY-LITTLE LONDON SP | Whitebridge Drain | 0 | 0h | - |
| Anglian Water | DOWNHAM MKT-LYNN ROAD OV | Relief Ch | 0 | 0h | - |
| Anglian Water | Mundford WRC | River Wissey | 0 | 0h | - |
| Anglian Water | FELTWELL STW | Cut-Off Channel | 0 | 0h | - |
| 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 | - |
| Anglian Water | DOWNHAM MARKET-THE HYTHE SP | Relief Channel | 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
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