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Polluted by sewage 2,644 hours in 2025
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We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for Hitchin, here you can see overflows in red, the darker the red, the more the CSO overflowed that day.
Each CSO has a row, the most recent data is on the right hand side.
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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Total Duration (days) |
|---|---|---|---|---|---|
| Anglian Water | ASHBROOK STW | Ash Brook, River Great Ouse | 28 | 564 h 27m | 23.5 |
| Anglian Water | CLIFTON STW | Henlow Brook | 28 | 528 h 31m | 22 |
| Anglian Water | HITCHIN STW | River Hiz | 29 | 523 h 33m | 21.79 |
| Anglian Water | HITCHIN STW | River Hiz | 23 | 514 h 59m | 21.42 |
| Anglian Water | ASHBROOK STW | Ash Brook, River Great Ouse | 16 | 330 h 45m | 13.75 |
| Thames Water | Whitwell STW | River Mimram | 13 | 92 h 45m | 3.83 |
| Anglian Water | CLIFTON STW | Henlow Brook | 3 | 40 h 48m | 1.67 |
| Anglian Water | HITCHIN STW | River Hiz | 2 | 13 h 43m | 0.54 |
| Anglian Water | STOTFOLD-BROOK END SP | Tingewick Brook | 1 | 9 h 45m | 0.38 |
| Anglian Water | POPPYHILL STW | River Ivel | 3 | 9 h 26m | 0.38 |
| Anglian Water | POPPYHILL STW | River Ivel | 1 | 6 h 14m | 0.25 |
| Anglian Water | HITCHIN STW | River Hiz | 4 | 5 h 5m | 0.21 |
| Anglian Water | STOTFOLD-BROOK END SP | Tingewick Brook | 2 | 1 h 54m | 0.04 |
| Anglian Water | HITCHIN - GOSMORE SP | Purwell | 1 | 1 h 21m | 0.04 |
| Anglian Water | PIRTON TPS | River Hiz | 1 | 1 h 15m | 0.04 |
| Anglian Water | HITCHIN - GOSMORE SP | Purwell | 0 | 0 h | 0 |
| Anglian Water | POPPYHILL STW | River Ivel | 0 | 0 h | 0 |
| Thames Water | Whitwell STW | River Mimram | 0 | 0 h | 0 |
| Anglian Water | POPPYHILL STW | River Ivel | 0 | 0 h | 0 |
| Anglian Water | HITCHIN-BANCROFT REC SSO | River Hiz | 0 | 0 h | 0 |
| Anglian Water | PIRTON TPS | River Hiz | 0 | 0 h | 0 |
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.
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org