Great Dunmow

Polluted by sewage 16 times in 2025 lasting 85 hours

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Totals for Great Dunmow in 2025

2 Sites polluted by Anglian Water

16 sewage dumps

85 hours duration

Sewage pollution map of Great Dunmow — Sewage pollution map of Great Dunmow: 85 hours in 2025

That's 3.54 days. 1.3 times a month, over the year

Change Over Time

Constituency for Great Dunmow

Nearby Constituencies

Waterways in Great Dunmow

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Great Dunmow 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 Chelmer	GREAT DUNMOW STW	13	83	100
Anglian Water	River Chelmer	GREAT DUNMOW STW	3	1	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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