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North East Hertfordshire - 2025 Sewage

Polluted by sewage 2,976 hours in 2025 , monitoring offline 1,256 hours

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

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View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in North East Hertfordshire for 2025. It is an estimate, based on very poor quality live data from the Water Companies. This may not align with the 'official' reported sewage values from the water companies, which is reported in April following then end of the year - so 2025 numbers are reported in April 2026.

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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Daily Data

Jan - 617 hours
Feb - 381 hours
Mar - 519 hours
Apr - 7 hours
May - 44 hours
Jun - 5 hours
Jul - 65 hours
Aug - 7 hours
Sept - 23 hours
Oct - 10 hours
Nov - 940 hours , 940 offline
Dec - 352 hours , 315 offline
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Anglian Water SHENFIELD SEWER SSO River Wid 54 646h 12m -
Thames Water Cottered STW Cottered Brook 32 539h 15m -
Anglian Water BARLEY STW Fowlmere Stream 40 530h 45m -
Anglian Water LETCHWORTH-NORTON COMMON SSO Pix Brook 28 512h 17m -
Thames Water Weston STW Weston 30 370h 30m -
Thames Water Barkway STW River Quin 7 93h -
Thames Water Weston STW Weston 8 90h 45m -
Thames Water Therfield STW River Rib 12 68h 15m 721 h
Thames Water Cottered STW Cottered Brook 6 54h 15m -
Anglian Water BALDOCK-NORTON ROAD SP Onto Land 5 28h 12m -
Thames Water Standon STW Rib 3 12h 30m -
Thames Water Chapmore End STW Rib 7 9h 45m -
Thames Water Buntingford STW River Rib 3 5h 15m -
Anglian Water BARLEY STW Fowlmere Stream 5 5h 12m 270 h
Anglian Water LETCHWORTH-NORTON COMMON SSO Pix Brook 1 5h 7m -
Anglian Water ASHWELL STW River Rhee 8 4h 51m -
Thames Water Chapmore End STW Rib 0 0h -
Anglian Water SANDON (NEW) STW Cat Of River Ivel 0 0h -
Thames Water Barkway STW River Quin 0 0h -
Thames Water Buntingford STW River Rib 0 0h -
Anglian Water Letchworth WRC Pix Brook, River Gt Ouse 0 0h 0 h
Thames Water Therfield STW River Rib 0 0h 264 h
Anglian Water BALDOCK-NORTON ROAD SP Onto Land 0 0h -
Thames Water Standon STW Rib 0 0h -
Anglian Water ASHWELL STW River Rhee 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

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.