Media Queries
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org
Please Support Us
We rely on donations to fund our work. Please support us if you can
Polluted by sewage 1,397 hours in 2025 , monitoring offline 129 hours
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.
Your local MP is Christopher Vince (Labour/Co-operative) - Find out more about their interests, donors, and voting at They Work For You
Please consider a one-off or small recurring donation. We need your help to keep this site going.
Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Offline/Potential Pollution |
|---|---|---|---|---|---|
| Thames Water | Hatfield Heath STW | Hatfield Heath Watercourse | 29 | 564h 30m | - |
| Thames Water | Takeley STW | Pincey Brook | 27 | 364h 30m | 80 h |
| Thames Water | Little Hallingbury STW | Little Hallingbury Brook | 23 | 183h | - |
| Thames Water | White Roding STW | White Roding | 14 | 111h 15m | 49 h |
| Thames Water | Takeley STW | Pincey Brook | 11 | 54h 45m | - |
| Thames Water | Wynters Brook (Hastingwood) SPS | Shonks Brook | 4 | 51h 45m | - |
| Thames Water | Little Hallingbury STW | Little Hallingbury Brook | 4 | 27h 15m | - |
| Thames Water | White Roding STW | White Roding | 4 | 18h | - |
| Thames Water | Wynters Brook (Hastingwood) SPS | Shonks Brook | 3 | 12h | - |
| Thames Water | Cage End (Hatfield Broadoak) SPS | Pinsey Brook | 5 | 10h 30m | - |
| Thames Water | Cage End (Hatfield Broadoak) SPS | Pinsey Brook | 0 | 0h | - |
| Thames Water | Hatfield Heath STW | Hatfield Heath Watercourse | 0 | 0h | - |
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.
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org