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Polluted by sewage 2,976 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 North East Hertfordshire, 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 | SHENFIELD SEWER SSO | River Wid | 54 | 646 h 12m | 26.92 |
| Thames Water | Cottered STW | Cottered Brook | 32 | 539 h 15m | 22.46 |
| Anglian Water | BARLEY STW | Fowlmere Stream | 40 | 530 h 45m | 22.08 |
| Anglian Water | LETCHWORTH-NORTON COMMON SSO | Pix Brook | 28 | 512 h 17m | 21.33 |
| Thames Water | Weston STW | Weston | 30 | 370 h 30m | 15.42 |
| Thames Water | Barkway STW | River Quin | 7 | 93 h | 3.88 |
| Thames Water | Weston STW | Weston | 8 | 90 h 45m | 3.75 |
| Thames Water | Therfield STW | River Rib | 12 | 68 h 15m | 2.83 |
| Thames Water | Cottered STW | Cottered Brook | 6 | 54 h 15m | 2.25 |
| Anglian Water | BALDOCK-NORTON ROAD SP | Onto Land | 5 | 28 h 12m | 1.17 |
| Thames Water | Standon STW | Rib | 3 | 12 h 30m | 0.5 |
| Thames Water | Chapmore End STW | Rib | 7 | 9 h 45m | 0.38 |
| Thames Water | Buntingford STW | River Rib | 3 | 5 h 15m | 0.21 |
| Anglian Water | BARLEY STW | Fowlmere Stream | 5 | 5 h 12m | 0.21 |
| Anglian Water | LETCHWORTH-NORTON COMMON SSO | Pix Brook | 1 | 5 h 7m | 0.21 |
| Anglian Water | ASHWELL STW | River Rhee | 8 | 4 h 51m | 0.17 |
| Anglian Water | Letchworth WRC | Pix Brook, River Gt Ouse | 0 | 0 h | 0 |
| Anglian Water | SANDON (NEW) STW | Cat Of River Ivel | 0 | 0 h | 0 |
| Thames Water | Chapmore End STW | Rib | 0 | 0 h | 0 |
| Thames Water | Standon STW | Rib | 0 | 0 h | 0 |
| Anglian Water | BALDOCK-NORTON ROAD SP | Onto Land | 0 | 0 h | 0 |
| Thames Water | Buntingford STW | River Rib | 0 | 0 h | 0 |
| Thames Water | Therfield STW | River Rib | 0 | 0 h | 0 |
| Anglian Water | ASHWELL STW | River Rhee | 0 | 0 h | 0 |
| Thames Water | Barkway STW | River Quin | 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