Chelmsford

Polluted by sewage 36 times in 2025 lasting 324 hours

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Totals for Chelmsford in 2025

7 Sites polluted by Anglian Water

36 sewage dumps

324 hours duration

Sewage pollution map of Chelmsford — Sewage pollution map of Chelmsford: 324 hours in 2025

That's 1.93 weeks. 3 times a month, over the year

Change Over Time

Constituency for Chelmsford

Nearby Constituencies

Waterways in Chelmsford

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Chelmsford 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 %
Anglian Water	River Can	AVON RD SSO CHELMSFORD	12	132	98.6
Anglian Water	Sandon Brook	RIGNALS LA CSO	9	119	99.7
Anglian Water	Blackwater Est	CHELMSFORD WATER RECYCLING CENTRE	9	63	100
Anglian Water	Baddow Brook	VICARAGE LA GT BADDOW	2	8	99.2
Anglian Water	Baddow Brook	GT BADDOW HIGH STREET TABORS	2	0	100
Anglian Water	Baddow Brook	GREAT BADDOW - BRAMSTON CLOSE CSO	1	0	92.4
Anglian Water	R Chelmer	UPLANDS DRIVE	1	0	100
Anglian Water	One Bridge Brook	CHELMSFORD - N MLBN CHIGNAL ROAD PS	0	0	100
Anglian Water	River Wid	CHELMSFORD-BUTTS WAY PS	0	0	100
Anglian Water	River Wid	CHELMSFORD-GALLEYWOOD ROAD PS	0	0	100
Anglian Water	R Chelmer	SPRINGFIELD - OAK LODGE SP	0	0	100
Anglian Water	Sandon Brook	LOWER GREEN GT BADDOW	0	0	100
Anglian Water	River Wid	WRITTLE - LAWFORD LANE PS	0	0	100

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.

Top of the Poops

Analysing sewage pollution by the Water Industry

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