Hitchin and Harpenden polluted by sewage 121 times in 2023 - lasting 301 hours
- but monitoring was disabled in some locations, so could be more

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Contains OS Data © Crown copyright & database right 2021-2023
© Top of the Poops 2021-2023
✔ means we have experimental daily data since 2023
Totals for Hitchin and Harpenden in 2023
6 Sites polluted by Anglian Water, Thames Water
121 sewage dumps
301 h duration
That's 12.54 days. 2.3 times a week, on average
Change Over Time
Daily Data Since 2023
     Monitoring Online      Monitoring Offline      Polluting      Potentially Polluting      Unknown
Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.

Pollution Summary 2023

Here are all the reported sewage overflow totals for Hitchin and Harpenden in 2023. 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 2 of the total 9 CSO locations had reporting enabled for less than half the year, of which 2 had zero reporting.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Anglian Water River Hiz HITCHIN WATER RECYCLING CENTRE 95 160 99.75
Anglian Water Ash Brook, River Great Ouse ASHBROOK WATER RECYCLING CENTRE 12 80 100
Thames Water Lee Harpenden 4 35 99.8
Thames Water River Mimram WHITWELL WWTW 2 12 99.8
Anglian Water River Hiz CSO AND EO AT PIRTON TPS 7 11 95.5
Anglian Water River Hiz BANCROFT RECREATION GROUND CSO 1 1 99.8
Anglian Water Unknown POUND FARM PUMPING STATION 0 0 100
Thames Water River Lee WHEATHAMPSTEAD PUMPING STATION , HE 0 0 0
Anglian Water River Oughton OLD HALE STORM OVERFLOW 0 0 0

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. This 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.