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Polluted by sewage 219 hours in 2026 , monitoring offline 114 hours , potential overflows 37 hours so far..
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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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Offline/Potential Pollution |
|---|---|---|---|---|---|
| United Utilities | HUYTON WwTW | Ditton Brook | 10 | 116h 50m | 68 h |
| United Utilities | Woolton WwTW | Halewood Brook | 8 | 38h 2m | 25 h |
| United Utilities | HUYTON WwTW | Ditton Brook | 15 | 33h 9m | 39 h |
| United Utilities | Garston CSO | Mersey Estuary | 17 | 20h 49m | - |
| United Utilities | Fleming Rd CSO (263DZ) | Ditton Brook | 10 | 5h 34m | 18 h |
| United Utilities | Woolton WwTW | Halewood Brook | 9 | 5h 24m | - |
| United Utilities | HUYTON WwTW | Ditton Brook | 0 | 0h | - |
| United Utilities | Woolton WwTW | Halewood Brook | 0 | 0h | - |
| United Utilities | Fleming Rd CSO (263DZ) | Ditton Brook | 0 | 0h | - |
| United Utilities | HUYTON WwTW | Ditton Brook | 0 | 0h | - |
| United Utilities | Woolton WwTW | Halewood Brook | 0 | 0h | - |
| United Utilities | Garston CSO | Mersey Estuary | 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