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Polluted by sewage 334 hours in 2026 , monitoring offline 3,069 hours so far..
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 | Stag Lane CSO | N/A | 42 | 154h 8m | - |
| Thames Water | Colin Crescent, Colindale | N/A | 23 | 150h 15m | 308 h |
| Thames Water | Brentfield gardens XX | River Brent | 12 | 23h | - |
| Thames Water | Boyne Avenue, Hendon | N/A | 4 | 6h 30m | - |
| Thames Water | Fairfield Avenue XX | N/A | 3 | 1h | 974 h |
| Thames Water | Colin Crescent, Colindale | N/A | 0 | 0h | - |
| Thames Water | Brentfield gardens | River Brent | 0 | 0h | - |
| Thames Water | Stag Lane CSO | N/A | 0 | 0h | - |
| Thames Water | Brentfield gardens | River Brent | 0 | 0h | - |
| Thames Water | Edgware Road | N/A | 0 | 0h | - |
| Thames Water | Brentfield gardens XX | River Brent | 0 | 0h | - |
| Thames Water | Edgware Road | N/A | 0 | 0h | 1,787 h |
| Thames Water | Fairfield Avenue XX | N/A | 0 | 0h | - |
| Thames Water | Boyne Avenue, Hendon | 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