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Polluted by sewage 1,286 hours in 2025 , monitoring offline 677 hours , potential overflows 359 hours
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 |
|---|---|---|---|---|---|
| Thames Water | Storm tanks,cascade rd,buckhurst hill | River Roding | 61 | 803h 45m | - |
| Thames Water | Thornwood STW | Cripsey Brook | 22 | 176h 45m | - |
| Thames Water | Rous road, buckhurst hill | Overflow Brook | 15 | 117h 40m | 1,036 h |
| Thames Water | Thornwood STW | Cripsey Brook | 8 | 63h 45m | - |
| Thames Water | Chigwell Road / Langston Road | N/A | 17 | 60h 4m | - |
| Thames Water | Storm tanks,cascade rd,buckhurst hill | River Roding | 11 | 53h 15m | - |
| Thames Water | Brook way, chigwell | Chigwell Brook | 6 | 8h 45m | - |
| Thames Water | Rous road, buckhurst hill | Overflow Brook | 1 | 2h 8m | - |
| Thames Water | Brook way, chigwell | Chigwell Brook | 0 | 0h | - |
| Thames Water | Chigwell Road / Langston Road | N/A | 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