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Polluted by sewage 82 times in 2025 lasting 105 hours
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Donate NowHere are all the reported sewage overflow totals for Cities of London and Westminster in 2025. Sometimes sewage can be being dumped for months at a time.
Reporting refers to how much of the time the monitoring was active. In this constituency all the declared CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s appeared to have monitoring enabled for more than 50% of the year
| Company | Waterway | Site | Sewage Dumps | Duration (Hours) | Reporting % |
|---|---|---|---|---|---|
| Thames Water | Tidal Thames | Low Level 1 N, Grosvenor Ditch, Mil | 22 | 37 | 94 |
| Thames Water | River Thames | WESTERN PS LOW LEVEL SEWER, LONDON | 5 | 23 | 98.3 |
| Thames Water | River Thames | SAVOY STREET, LONDON | 6 | 12 | 92.7 |
| Thames Water | River Thames | LOWER THAMES STREET, BEER LANE, LON | 24 | 9 | 100 |
| Thames Water | River Thames | WOOD STREET, LONDON | 4 | 4 | 79.5 |
| Thames Water | River Thames | KINGS SCHOLARS POND SEWER, LONDON | 4 | 4 | 100 |
| Thames Water | River Thames | FLEET MAIN LINE SEWER, LONDON | 2 | 3 | 99.8 |
| Thames Water | Tidal Thames | LONDON BRIDGE CSO | 7 | 3 | 100 |
| Thames Water | River Thames | HORSEFERRY ROAD SEWER, LONDON | 4 | 3 | 99.6 |
| Thames Water | River Thames | NORTHUMBERLAND STREET, LONDON | 1 | 1 | 99.5 |
| Thames Water | Tidal Thames | Temple Place, Essex Street | 1 | 0 | 100 |
| Thames Water | River Thames | GOSWELL STREET, S. BRANCH SEWER, LO | 2 | 0 | 95.2 |
| Thames Water | River Thames | NORFOLK STREET, LONDON | 0 | 0 | 99.6 |
| Thames Water | Tidal Thames | PAULS PIER COMBINED SEWER OVERFLOW | 0 | 0 | 96.4 |
| Thames Water | River Thames | REGENT STREET, LONDON | 0 | 0 | 97.3 |
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.
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Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org