Media Queries
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Polluted by sewage 33 hours in 2025 , monitoring offline 4,033 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 | Nightingale lane | River Thames | 25 | 17h 54m | 100 h |
| Thames Water | Iron gate | River Thames | 17 | 11h | - |
| Thames Water | Ne storm relief shadwell, king edward mem park | Tidal Thames | 3 | 2h 2m | 166 h |
| Thames Water | Isle of Dogs SWPS | River Thames | 2 | 1h 30m | - |
| Thames Water | Nightingale lane | River Thames | 1 | 1h 10m | - |
| Thames Water | Bell wharf | Tidal Riverthames | 0 | 0h | - |
| Thames Water | Gun wharf (wapping dock) | River Thames | 0 | 0h | 2,791 h |
| Thames Water | Ratcliffe highway limekiln | Tidal Thames | 0 | 0h | - |
| Thames Water | Bell wharf | Tidal Riverthames | 0 | 0h | 100 h |
| Thames Water | Iron gate | River Thames | 0 | 0h | - |
| Thames Water | Isle of Dogs SWPS | River Thames | 0 | 0h | - |
| Thames Water | Gun wharf (wapping dock) | River Thames | 0 | 0h | - |
| Thames Water | Ratcliffe highway limekiln | Tidal Thames | 0 | 0h | 813 h |
| Thames Water | Ne storm relief shadwell, king edward mem park | Tidal Thames | 0 | 0h | 59 h |
| Thames Water | Holloway storm sewer | River Thames | 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