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Polluted by sewage 6,453 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 Brentwood and Ongar, 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) |
|---|---|---|---|---|---|
| Thames Water | Willingale STW | River Roding | 78 | 1,363 h 45m | 56.79 |
| Anglian Water | SHENFIELD AND HUTTON STW | River Wid | 44 | 1,012 h 59m | 42.17 |
| Anglian Water | SHENFIELD AND HUTTON STW | River Wid | 48 | 804 h 56m | 33.5 |
| Thames Water | Abbess Roding STW | Coopers Brook | 63 | 738 h 15m | 30.75 |
| Anglian Water | INGATESTONE STW | River Wid | 35 | 606 h 55m | 25.25 |
| Thames Water | Theydon Bois STW | Brookhouse Brook | 63 | 486 h | 20.25 |
| Thames Water | Fiddlers Hamlet STW | Brookhouse Brook | 42 | 467 h 45m | 19.46 |
| Thames Water | North Weald STW | North Weald Brook | 35 | 353 h 45m | 14.71 |
| Thames Water | Fiddlers Hamlet STW | Brookhouse Brook | 11 | 138 h 30m | 5.75 |
| Thames Water | Theydon Bois STW | Brookhouse Brook | 17 | 127 h 15m | 5.29 |
| Thames Water | North Weald STW | North Weald Brook | 13 | 115 h 15m | 4.79 |
| Anglian Water | SHENFIELD AND HUTTON STW | River Wid | 8 | 66 h 4m | 2.75 |
| Thames Water | Weald Bridge Road (North Weald) SPS | Cripsey Brook | 5 | 47 h 15m | 1.96 |
| Thames Water | Hull Green (Matching) SPS | Colville Hall Brook | 3 | 42 h 45m | 1.75 |
| Thames Water | Abbess Roding STW | Coopers Brook | 4 | 24 h 15m | 1 |
| Anglian Water | INGATESTONE STW | River Wid | 5 | 22 h 45m | 0.92 |
| Thames Water | Weald Bridge Road (North Weald) SPS | Cripsey Brook | 3 | 12 h | 0.5 |
| Anglian Water | WARLEY-WARLEY STREET SP | Mardyke Thames Estuary | 5 | 9 h 32m | 0.38 |
| Thames Water | Willingale STW | River Roding | 1 | 5 h | 0.21 |
| Anglian Water | INGRAVE-PS | Haveringsgrove Brook | 1 | 3 h 50m | 0.12 |
| Anglian Water | WARLEY EAST SP | Mardyke W Thames Est | 1 | 2 h 14m | 0.08 |
| Anglian Water | DODDINGHURST-STW | River Wid | 2 | 1 h 30m | 0.04 |
| Anglian Water | WARLEY EAST SP | Mardyke W Thames Est | 1 | 0 h 35m | 0 |
| Anglian Water | SHENFIELD SEWER SSO | River Wid | 0 | 0 h | 0 |
| Anglian Water | DODDINGHURST-STW | River Wid | 0 | 0 h | 0 |
| Anglian Water | SHENFIELD AND HUTTON STW | River Wid | 0 | 0 h | 0 |
| Anglian Water | INGRAVE-PS | Haveringsgrove Brook | 0 | 0 h | 0 |
| Anglian Water | DODDINGHURST-STW | River Wid | 0 | 0 h | 0 |
| Thames Water | Hull Green (Matching) SPS | Colville Hall Brook | 0 | 0 h | 0 |
| Anglian Water | WARLEY-WARLEY STREET SP | Mardyke Thames Estuary | 0 | 0 h | 0 |
| Anglian Water | BLACKMORE-THE GREEN SP | River Wid | 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