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Dorking and Horley was polluted by sewage 596 times in 2023
lasting 7,120 hours
- but monitoring was disabled in some locations, so could be more

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Constituency

✔ means we have experimental daily data since 2023

Totals for Dorking and Horley in 2023

19 Sites polluted by Thames Water

596 sewage dumps
7,120 h duration

That's 9.89 months. On average 1.6 times a day

Change Over Time

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Constituencies near Dorking and Horley

Waterways in Dorking and Horley

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 Dorking and Horley 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 3 of the total 22 CSO locations had reporting enabled for less than half the year, of which 3 had zero reporting.

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Thames Water	Holmwood Stm Leigh Brk	HOLMWOOD SEWAGE TREATMENT WORKS	118	1,997	99.8
Thames Water	Burstow Stream	BURSTOW STW, HATHERSHAM ROAD, SMALL	126	1,370	99.9
Thames Water	Mole	LEE STREET	80	1,240	97.7
Thames Water	River Mole	DORKING STW (STORM)	71	920	100
Thames Water	River Mole	IRONSBOTTOM (SIDLOW) WWTW	34	623	99.2
Thames Water	Mans Brook	CHARLWOOD, SURREY	41	328	87.3
Thames Water	River Mole	COACH ROAD CSO ON STONEBRIDGE SEWER	19	154	50.4
Thames Water	Deanoak Brook	CSO AT CAPEL SPS	24	138	75.3
Thames Water	Thornhurst Brook	Canfold Wood	23	124	97
Thames Water	River Mole	Brockham Bridge	8	50	97.3
Thames Water	Cobbler'S Brook	Ockley Road	9	45	92
Thames Water	Mole	CASTLE GARDENS SPS	5	32	76.1
Thames Water	Salfords Stream	SALFORDS SEWAGE PUMPING STATION	7	25	99.3
Thames Water	Into Land	Box Hill	11	20	70.1
Thames Water	Mole	RIVER LANE PUMPING STATION, FETCHAM	4	18	99.8
Thames Water	Deanoak Brook	Dean Oak Lane	7	12	100
Thames Water	Tanners Brook	SPOOKS HILL, NORTH HOLMWOOD, SURREY	6	9	97.1
Thames Water	Bookham Brook	Commonside	2	8	96.1
Thames Water	Tanners Brook	SURFACE WATER SEWER	1	1	99.3
Thames Water	Bents Brook	Bentsbrook Road, Dorking	0	0	0
Thames Water	Burstow Stream	Burstow	0	0	0
Thames Water	Mole	Horley Road, Charlwood	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.

Analysing sewage pollution by the Water Industry

With generous support from:

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