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Hertford and Stortford - Live Sewage

Polluted by sewage 401 hours in 2026 , monitoring offline 123 hours so far..

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

Which Year?

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✔ means we have live data (𝑥 if not)

View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Hertford and Stortford so far for 2026. It is an estimate, based on very poor quality live data from the Water Companies. The water companies report their sewage to the Environment Agency every year in April. You can see the last reported year in the other page

What's a potential overflow? If the CSO goes 'Offline' while its Overflowing, we don't know if it stopped overflowing until we get a 'Stop' event.

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Constituencies near Hertford and Stortford

Daily Data

Jan - 99 hours , 41 offline
Feb - 301 hours , 82 offline
Mar - 0 hours
Apr - 0 hours
May - 0 hours
Jun - 0 hours
Jul - 0 hours
Aug - 0 hours
Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.
Please note: We don't have rainfall data for Wales. If you know where to source it please let us know!
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Thames Water Widford STW River Ash 28 385h 30m -
Thames Water Bakers Farm (Sawbridgeworth) SPS High Wych Ditch 2 11h 15m -
Thames Water Bishop stortford main SPS Stort Navigation 2 4h 24m 123 h
Thames Water Hadham Mill (Much Hadham) SPS River Ash 0 0h -
Thames Water Bakers Farm (Sawbridgeworth) SPS High Wych Ditch 0 0h -
Thames Water Hadham Mill (Much Hadham) SPS River Ash 0 0h -
Thames Water Bishop stortford main SPS Stort Navigation 0 0h -
Thames Water Widford STW River Ash 0 0h -

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

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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© Openstreetmap contributors, Contains OS data © Crown copyright and database right 2021-2025,
Contains Water UK National Storm Overflow Hub Data CC-BY-SA 4.0 and analysis © 2025 Top-Of-The-Poops

Some data reproduced under Open Government Licence

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