Polluted by sewage 244 hours in 2025 , monitoring offline 366 hours , potential overflows 2 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.
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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Offline/Potential Pollution |
|---|---|---|---|---|---|
| United Utilities | Princess Parkway/M60 CSO | River Mersey | 21 | 99h 18m | - |
| United Utilities | Outside 91 Styal Road CSO | Gatley Brook Via Sws | 7 | 41h 58m | 366 h |
| United Utilities | Sledmoor Road CSO | River Mersey | 14 | 29h 58m | 1 h |
| United Utilities | Sledmoor Road CSO | River Mersey | 16 | 26h 26m | 2 h |
| United Utilities | The Danefield Road CSO | River Mersey | 4 | 23h 51m | 0 h |
| United Utilities | Kenworthy Lane PS | River Mersey | 5 | 22h 23m | - |
| United Utilities | Kenworthy Lane PS | River Mersey | 1 | 0h 38m | - |
| United Utilities | Princess Parkway/M60 CSO | River Mersey | 1 | 0h | - |
| United Utilities | The Danefield Road CSO | River Mersey | 0 | 0h | - |
| United Utilities | Outside 91 Styal Road CSO | Gatley Brook Via Sws | 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.