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North East Hertfordshire

Polluted by sewage 199 times in 2025 lasting 1,315 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 North East Hertfordshire in 2026

So far this year (as of 6 Oct 2026, 06:30) there has been 1,177 hours of sewage overflows, from 25 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s

Sewage without rain in North East Hertfordshire

On 9 occasions since December 2024, no rain fell anywhere in North East Hertfordshire 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 - 10 Mar 2025 1 at once · 120h 28 Mar - 29 Mar 2025 1 at once · 23h 20 Mar 2025 1 at once · 13h

Totals for North East Hertfordshire in 2025

12 Sites polluted by Anglian Water Thames Water
199 sewage dumps
1,315 hours duration
That's 1.83 months. 3.8 times a week, on average

Change Over Time

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Sewage pollution map of North East Hertfordshire: 199 spills in 2025, lasting 1,315 hours, by Anglian Water and Thames Water
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Waterways in North East Hertfordshire

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Pollution Summary 2025

Here are all the reported sewage overflow totals for North East Hertfordshire 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 Cottered Brook COTTERED WASTEWATER TREATMENT WORKS 36 594 100
Thames Water River Beane WESTON (HERTS) WWTW 39 461 100
Thames Water River Quin BARKWAY WASTEWATER TREATMENT WORKS 7 93 100
Thames Water River Rib THERFIELD WTW 5 58 99.7
Anglian Water Fowlmere Stream BARLEY STW 29 36 100
Anglian Water Pix Brook, River Gt Ouse LETCHWORTH WATER RECYCLING CENTRE 5 24 100
Anglian Water Pix Brook LETCHWORTH-NORTON COMMON CSO 8 13 98.1
Thames Water River Rib STANDON STW, STANDON, HERTS 2 10 99.4
Thames Water Rib Chapmore End 7 9 100
Anglian Water River Rhee ASHWELL WATER RECYCLING CENTRE 10 5 100
Thames Water River Rib BUNTINGFORD WWTW 3 5 100
Anglian Water Onto Land BALDOCK PS 48 3 99.7
Anglian Water Cat Of River Ivel SANDON STW 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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