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Wandsworth

Polluted by sewage 214 times in 2025 lasting 476 hours

Monitoring fell below 50% in some locations so could be more

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Totals for Wandsworth in 2025

25 Sites polluted by Thames Water

214 sewage dumps

476 hours duration

That's 2.83 weeks. 4.1 times a week, on average

Change Over Time

Constituency for Wandsworth

Nearby Constituencies

Waterways in Wandsworth

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Wandsworth 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 1 of the total 31 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway locations had reporting enabled for less than half the year.

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Thames Water	Graveney	Streatham & Balham Storm Relief	69	112	95.05
Thames Water	Graveney	Streatham Storm Relief	56	91	99.97
Thames Water	Tidal Thames	Low Level 1 N, Grosvenor Ditch, Mil	22	37	94
Thames Water	Tidal Thames	West Putney S R, Home Way	3	36	99.8
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	Thames Tidal	WANDSWORTH, LONDON SW11	4	20	99.9
Thames Water	River Thames	PUTNEY BRIDGE STREET, LONDON	2	15	95.7
Thames Water	Bell Lane Creek	Frogmore Storm	2	13	100
Thames Water	River Thames	COUNTERS CREEK, LOTS ROAD PS, LONDO	1	9	49.3
Thames Water	River Thames	FALCON BROOK PS, LONDON	3	8	99.9
Thames Water	Beverley Brook	PRIORY LANE, MORTLAKE CSO	3	7	87.8
Thames Water	River Graveney	Streatham Vale Storm Relief	7	7	74.2
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 Wandle	CSO AT DUNTSHILL ROAD	1	4	100
Thames Water	River Thames	KINGS SCHOLARS POND SEWER, LONDON	4	4	100
Thames Water	River Thames	HORSEFERRY ROAD SEWER, LONDON	4	3	99.6
Thames Water	Wandle	Bell Lane Creek	1	1	99.4
Thames Water	River Graveney	CSO AT LONGLEY ROAD	2	1	97.8
Thames Water	River Thames	CHURCH STREET SEWER, LONDON	2	1	100
Thames Water	River Wandle	CSO AT MAPLETON ROAD/BRATHWAY ROAD	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 Wandle	CSO AT PENWITH ROAD	0	0	100
Thames Water	Beverley Brook	Road A3, Roehampton Vale	0	0	89.5
Thames Water	River Thames	WANDLE VALLEY, LONDON	0	0	94.4
Thames Water	River Wandle	CSO AT GAP ROAD (CEMETERY)	0	0	99.77

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

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.

Analysing sewage pollution by the Water Industry

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