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Polluted by sewage 4,377 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 Witham, 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 | COPFORD STW | Roman River | 50 | 1,087 h 49m | 45.29 |
| Anglian Water | TOLLESHUNT KNIGHTS-BROOK R TPS | Layer Brook | 50 | 648 h 27m | 27 |
| Anglian Water | EARLS COLNE STW | River Colne | 30 | 616 h 21m | 25.67 |
| Anglian Water | HALSTEAD STW | River Colne | 30 | 578 h 54m | 24.08 |
| Anglian Water | KELVEDON-GREYS MILL SO | River Blackwater | 33 | 511 h 15m | 21.29 |
| Anglian Water | WITHAM STW | Tidal River Chelmer | 11 | 189 h 44m | 7.88 |
| Anglian Water | EARLS COLNE STW | River Colne | 8 | 106 h 52m | 4.42 |
| Anglian Water | Earls Colne Church Hill #3 Combined Sewer Overflow | River Colne | 41 | 100 h 56m | 4.17 |
| Anglian Water | GREAT TOTHAM STW | Spicketts Brook Blackwater | 9 | 94 h 46m | 3.92 |
| Anglian Water | Tollesbury Water Recycling Centre | Tollesbury Fleet To Blackwater | 6 | 71 h | 2.96 |
| Anglian Water | TIPTREE STW | Virley Brook Salcottcreek | 5 | 55 h 57m | 2.29 |
| Anglian Water | STISTED STW | Stisted Brook River Blackwater | 3 | 55 h 15m | 2.29 |
| Anglian Water | TOLLESHUNT KNIGHTS-FORGE SP | Layer Brook | 8 | 43 h 59m | 1.79 |
| Anglian Water | TOLLESHUNT KNIGHTS-BROOK R TPS | Layer Brook | 7 | 31 h 12m | 1.29 |
| Anglian Water | TOLLESBURY-WOODROLFE RD OV | Tollesbury Fleet | 2 | 25 h | 1.04 |
| Anglian Water | HALSTEAD STW | River Colne | 5 | 25 h | 1.04 |
| Anglian Water | GREAT TOTHAM STW | Spicketts Brook Blackwater | 3 | 24 h 30m | 1 |
| Anglian Water | TIPTREE-GORSE LA TPS | Layer Brook | 4 | 23 h 29m | 0.96 |
| Anglian Water | Maldon STW | Pennys Brook | 2 | 16 h 29m | 0.67 |
| Anglian Water | COPFORD STW | Roman River | 5 | 13 h 21m | 0.54 |
| Anglian Water | COGGESHALL-EAST ST SO | River Blackwater | 3 | 11 h 45m | 0.46 |
| Anglian Water | Hatfield Peverel Crabbs Hill Terminal Pumping Station | River Ter | 3 | 11 h 37m | 0.46 |
| Anglian Water | LT TOTHAM-SCHOOL RD TPS | Penny'S Brook River Blackwater | 1 | 10 h | 0.42 |
| Anglian Water | STISTED STW | Stisted Brook River Blackwater | 2 | 10 h | 0.42 |
| Anglian Water | EARLS COLNE-COLCHESTER RD TPS | River Colne | 3 | 3 h 50m | 0.12 |
| Anglian Water | KELVEDON-GREYS MILL SO | River Blackwater | 3 | 2 h 15m | 0.08 |
| Anglian Water | TIPTREE-GORSE LA TPS | Layer Brook | 1 | 2 h | 0.08 |
| Anglian Water | KELVEDON-STATION RD SO | Blackwater | 5 | 1 h 14m | 0.04 |
| Anglian Water | TIPTREE STW | Virley Brook Salcottcreek | 1 | 1 h 14m | 0.04 |
| Anglian Water | COGGESHALL STW | River Blackwater | 1 | 1 h 7m | 0.04 |
| Anglian Water | Earls Colne St Andrews Church Combined Sewer Overflow | River Colne | 2 | 0 h 35m | 0 |
| Anglian Water | Earls Colne Church Hill #3 Combined Sewer Overflow | River Colne | 2 | 0 h 22m | 0 |
| Anglian Water | EARLS COLNE-COLCHESTER RD TPS | River Colne | 2 | 0 h 20m | 0 |
| Anglian Water | KELVEDON-EASTERFORD RD SO | Blackwater | 1 | 0 h 15m | 0 |
| Anglian Water | Tolleshunt D'Arcy Sewage Treatment Works | Bowstead Brook River Blackwate | 0 | 0 h | 0 |
| Anglian Water | KELVEDON-STATION RD SO | Blackwater | 0 | 0 h | 0 |
| Anglian Water | LT TOTHAM-SCHOOL RD TPS | Penny'S Brook River Blackwater | 0 | 0 h | 0 |
| Anglian Water | COGGESHALL STW | River Blackwater | 0 | 0 h | 0 |
| Anglian Water | Tolleshunt D'Arcy Sewage Treatment Works | Bowstead Brook River Blackwate | 0 | 0 h | 0 |
| Anglian Water | Earls Colne St Andrews Church Combined Sewer Overflow | River Colne | 0 | 0 h | 0 |
| Anglian Water | WITHAM STW | Tidal River Chelmer | 0 | 0 h | 0 |
| Anglian Water | WHITE NOTLEY STW | River Brain | 0 | 0 h | 0 |
| Anglian Water | WHITE NOTLEY-TPS | River Brain | 0 | 0 h | 0 |
| Anglian Water | TOLLESHUNT KNIGHTS-FORGE SP | Layer Brook | 0 | 0 h | 0 |
| Anglian Water | KELVEDON-EASTERFORD RD SO | Blackwater | 0 | 0 h | 0 |
| Anglian Water | COGGESHALL-EAST ST R O #18 OV | River Blackwater | 0 | 0 h | 0 |
| Anglian Water | WHITE NOTLEY STW | River Brain | 0 | 0 h | 0 |
| Anglian Water | COGGESHALL-EAST ST SO | River Blackwater | 0 | 0 h | 0 |
| Anglian Water | Tollesbury Water Recycling Centre | Tollesbury Fleet To Blackwater | 0 | 0 h | 0 |
| Anglian Water | Hatfield Peverel Crabbs Hill Terminal Pumping Station | River Ter | 0 | 0 h | 0 |
| Anglian Water | Maldon STW | Pennys Brook | 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