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Polluted by sewage 5,742 hours in 2025
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We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for South West Norfolk, here you can see overflows in red, the darker the red, the more the CSO overflowed that day.
Each CSO has a row, the most recent data is on the right hand side.
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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Total Duration (days) |
|---|---|---|---|---|---|
| Anglian Water | SOUTHERY-MILL DROVE STW | White Bridge Drain River Great | 159 | 3,780 h | 157.5 |
| Anglian Water | DOWNHAM MARKET-RAILWAY SSO | Flood Relief Channel Sur W Sew | 60 | 572 h 59m | 23.83 |
| Anglian Water | DOWNHAM MARKET STW | Flood Relief Channel | 27 | 551 h 14m | 22.96 |
| Anglian Water | SWAFFHAM STW | River Wissey | 41 | 544 h 8m | 22.67 |
| Anglian Water | DOWNHAM MARKET STW | Flood Relief Channel | 8 | 94 h 48m | 3.92 |
| Anglian Water | FELTWELL STW | Cut-Off Channel | 11 | 47 h | 1.96 |
| Anglian Water | DOWNHAM MARKET STW | Flood Relief Channel | 2 | 33 h 22m | 1.38 |
| Anglian Water | DOWNHAM MARKET-RAILWAY SSO | Flood Relief Channel Sur W Sew | 13 | 30 h 24m | 1.25 |
| Anglian Water | WATTON STW | Watton Brook | 3 | 26 h 59m | 1.08 |
| Anglian Water | NARBOROUGH STW | Ketlam Drain River Nar | 3 | 26 h 44m | 1.08 |
| Anglian Water | SWAFFHAM STW | River Wissey | 7 | 20 h 26m | 0.83 |
| Anglian Water | SOUTHERY-MILL DROVE STW | White Bridge Drain River Great | 4 | 11 h 45m | 0.46 |
| Anglian Water | NARBOROUGH STW | Ketlam Drain River Nar | 1 | 2 h | 0.08 |
| Anglian Water | THETFORD-HAYLING PATH SP | River Little Ouse | 1 | 0 h 17m | 0 |
| Anglian Water | DOWNHAM MARKET-DENIS SNZM SSO | Un Relief Chann | 1 | 0 h 3m | 0 |
| Anglian Water | Mundford WRC | River Wissey | 0 | 0 h | 0 |
| Anglian Water | DOWNHAM MARKET STW | Flood Relief Channel | 0 | 0 h | 0 |
| Anglian Water | DOWNHAM MARKET-DENIS SNZM SSO | Un Relief Chann | 0 | 0 h | 0 |
| Anglian Water | SOUTHERY-LITTLE LONDON SP | Whitebridge Drain | 0 | 0 h | 0 |
| Anglian Water | THETFORD-HAYLING PATH SP | River Little Ouse | 0 | 0 h | 0 |
| Anglian Water | DOWNHAM MKT-LYNN ROAD OV | Relief Ch | 0 | 0 h | 0 |
| Anglian Water | Thetford WRC | River Little Ouse | 0 | 0 h | 0 |
| Anglian Water | WATTON STW | Watton Brook | 0 | 0 h | 0 |
| Anglian Water | DOWNHAM MARKET-THE HYTHE SP | Relief Channel | 0 | 0 h | 0 |
| Anglian Water | Thetford WRC | River Little Ouse | 0 | 0 h | 0 |
| Anglian Water | FELTWELL STW | Cut-Off Channel | 0 | 0 h | 0 |
| Anglian Water | STOKE FERRY STW | Red Gate Drain | 0 | 0 h | 0 |
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