Cities of London and Westminster - Live Sewage

Polluted by sewage 74 hours in 2026 , monitoring offline 8,513 hours , potential overflows 141 hours so far..

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Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024

Which Year?

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✔ means we have live data (𝑥 if not)

View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Cities of London and Westminster so far for 2026. It is an estimate, based on very poor quality live data from the Water Companies. The water companies report their sewage to the Environment Agency every year in April. You can see the last reported year in the other page

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.

Totals for Cities of London and Westminster in 2026

Sewage74 hours
Monitoring offline8,513 hours
Potential pollution141 hours
Storm overflows32

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Daily Data

Jan - 7 hours , 765 offline
Feb - 11 hours , 592 offline
Mar - 36 hours , 539 offline
Apr - 3 hours , 38 potential
May - 0 hours , 103 potential
Jun - 0 hours , 720 offline
Jul - 0 hours , 1,354 offline
Aug - 0 hours , 1,539 offline
Sept - 7 hours , 982 offline
Oct - 6 hours , 1,500 offline
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Thames Water Savoy street River Thames 5 39h 50m 5,939 h
Thames Water Low level XX, grosvenor ditch, millb Tidal Thames 13 24h 26m 568 h
Thames Water Western (Pimlico) SPS River Thames 4 8h 22m -
Thames Water Beer lane River Thames 3 1h 2m -
Thames Water Horseferry road River Thames 2 0h 20m 1,244 h
Thames Water Wood street River Thames 0 0h -
Thames Water Pauls pier Tidal Thames 0 0h -
Thames Water Temple place essex street Tidal Thames 0 0h -
Thames Water Northumberland street River Thames 0 0h -
Thames Water Beer lane River Thames 0 0h -
Thames Water Norfolk street River Thames 0 0h -
Thames Water Pauls pier Tidal Thames 0 0h -
Thames Water Goswell street River Thames 0 0h -
Thames Water Unknown Unknown 0 0h 128 h
Thames Water Low level XX, grosvenor ditch, millb Tidal Thames 0 0h -
Thames Water London bridge Tidal Thames 0 0h -
Thames Water Horseferry road River Thames 0 0h -
Thames Water London bridge Tidal Thames 0 0h -
Thames Water Norfolk street River Thames 0 0h -
Thames Water Western (Pimlico) SPS River Thames 0 0h -
Thames Water Fleet main line sewer A River Thames 0 0h -
Thames Water Wood street River Thames 0 0h -
Thames Water Goswell street River Thames 0 0h -
Thames Water Kings scholars pond River Thames 0 0h -
Thames Water Kings scholars pond River Thames 0 0h 351 h
Thames Water Temple place essex street Tidal Thames 0 0h -
Thames Water Regent street River Thames 0 0h -
Thames Water Savoy street River Thames 0 0h -
Thames Water Unknown Unknown 0 0h -
Thames Water Fleet main line sewer A River Thames 0 0h 159 h
Thames Water Northumberland street River Thames 0 0h 262 h
Thames Water Regent street River Thames 0 0h -

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. 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.