City of Westminster

Polluted by sewage 67 times in 2025 lasting 163 hours

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Totals for City of Westminster in 2025

14 Sites polluted by Thames Water

67 sewage dumps

163 hours duration

Sewage pollution map of City of Westminster — Sewage pollution map of City of Westminster: 163 hours in 2025

That's 6.79 days. 1.3 times a week, on average

Change Over Time

Constituency for City of Westminster

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Waterways in City of Westminster

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Pollution Summary 2025

Here are all the reported sewage overflow totals for City of 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 place 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	BRIXTON STORM RELIEF SEWER, LONDON	5	32	66.6
Thames Water	River Thames	HEATH WALL PS, LONDON	4	29	99.6
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	SMITH STREET, LONDON	6	4	95.3
Thames Water	River Thames	WOOD STREET, LONDON	4	4	79.5
Thames Water	River Thames	SLOANE STREET, RANELAGH GDNS, LONDO	1	4	100
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	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	QUEEN STREET, LONDON	2	0	100
Thames Water	River Thames	SW STORM RELIEF SEWER, LONDON	0	0	100
Thames Water	Thames Tidal	CHELSEA, LONDON SW10	0	0	100
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

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.

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Analysing sewage pollution by the Water Industry

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