Cities of London and Westminster was polluted by sewage 359 times in 2023
lasting 597 hours
- but monitoring was disabled in some locations, so could be more

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2023
© Top of the Poops 2021-2023
✔ means we have experimental daily data since 2023
Totals for Cities of London and Westminster in 2023
14 Sites polluted by Thames Water
359 sewage dumps
597 h duration
That's 24.88 days. 6.9 times a week, on average
Change Over Time
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Waterways in Cities of London and Westminster
Daily Data Since 2023
     Monitoring Online      Monitoring Offline      Polluting      Potentially Polluting      Unknown
Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.

Pollution Summary 2023

Here are all the reported sewage overflow totals for Cities of London and Westminster in 2023. 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 1 of the total 15 CSO locations had reporting enabled for less than half the year, of which 1 had zero reporting.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Thames Water River Thames FLEET MAIN LINE SEWER, LONDON 71 117 79.07
Thames Water Tidal Thames PAULS PIER COMBINED SEWER OVERFLOW 78 108 99.8
Thames Water River Thames WESTERN PS LOW LEVEL SEWER, LONDON 22 74 99.7
Thames Water Tidal Thames Low Level 1 N, Grosvenor Ditch, Mil 31 67 91.8
Thames Water River Thames NORTHUMBERLAND STREET, LONDON 19 41 95.7
Thames Water River Thames HORSEFERRY ROAD SEWER, LONDON 25 35 96.7
Thames Water River Thames REGENT STREET, LONDON 13 28 99.1
Thames Water River Thames KINGS SCHOLARS POND SEWER, LONDON 16 27 84
Thames Water River Thames LOWER THAMES STREET, BEER LANE, LON 36 26 100
Thames Water Tidal Thames Temple Place, Essex Street 13 24 100
Thames Water River Thames WOOD STREET, LONDON 13 19 99.8
Thames Water River Thames NORFOLK STREET, LONDON 10 14 99.5
Thames Water Tidal Thames LONDON BRIDGE CSO 7 12 81.2
Thames Water River Thames GOSWELL STREET, S. BRANCH SEWER, LO 5 1 73.4
Thames Water River Thames SAVOY STREET, LONDON 0 0 0

Data Sources & Accuracy

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. This 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.