Brentwood and Ongar

Polluted by sewage 335 times in 2025 lasting 3,469 hours

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Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024

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Live data for Brentwood and Ongar in 2026

So far this year (as of 26 Oct 2026, 02:30) there has been 6,410 hours of sewage overflows, from 32 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s

Sewage without rain in Brentwood and Ongar

On 18 occasions since December 2024, no rain fell anywhere in Brentwood and Ongar for days — and its CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s discharged anyway.

6 Mar - 11 Mar 2025 2 at once · 130h 19 Mar - 21 Mar 2026 2 at once · 45h 3 Apr - 4 Apr 2026 1 at once · 30h

Totals for Brentwood and Ongar in 2025

14 Sites polluted by Anglian Water Thames Water
335 sewage dumps
3,469 hours duration
Sewage pollution map of Brentwood and Ongar
Sewage pollution map of Brentwood and Ongar: 335 spills in 2025, lasting 3,469 hours, by Anglian Water and Thames Water
That's 4.82 months. 6.4 times a week, on average

Change Over Time

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Waterways in Brentwood and Ongar

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Brentwood and Ongar 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 constituency 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 River Cherwell WILLINGALE WWTW 55 1,077 96.4
Thames Water Brookhouse Brook Theydon Bois 85 634 100
Thames Water Brookhouse Brook EPPING WASTEWATER TREATMENT WORKS 49 603 99.9
Thames Water Northweald Brook NORTH WEALD STW, NORTH WEALD, ESSEX 46 473 100
Thames Water River Ingrebourne BRENTWOOD (NAGS HEAD LANE) WWTW 17 192 96.8
Anglian Water River Wid SHENFIELD STW NO 2 PS 32 170 100
Anglian Water River Wid INGATESTONE WATER RECYCLING CENTRE 20 128 100
Anglian Water R Wid SO AT SHENFIELD SEWER 11 61 92
Thames Water Cripsey Brook Wealdbridge, North Weald 8 60 98.2
Thames Water Colville Hall Brook HULL GREEN (MATCHING) SPS 3 42 97.5
Anglian Water River Wid DODDINGHURST WRC 2 9 100
Anglian Water Mardyke Thames Estuary WARLEY WEST PS 3 7 100
Anglian Water Haveringsgrove Brook INGRAVE PUMPING STATION 1 4 100
Anglian Water River Wid DODDINGHURST STW 3 3 99.8
Anglian Water River Wid B'MORE THE GREEN INGATESTONE RD PS 0 0 100
Anglian Water River Wid SHENFIELD AND HUTTON WRC 0 0 100
Anglian Water Mardyke W Thames Est WARLEY EAST 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.

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Analysing sewage pollution by the Water Industry

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