Media Queries
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Polluted by sewage 1,801 hours in 2025 , monitoring offline 5,898 hours , potential overflows 3,139 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 | BIRKENHEAD WwTW | River Mersey Estuary/River Birket | 84 | 909h 38m | - |
| United Utilities | BIRKENHEAD WwTW | River Mersey Estuary/River Birket | 25 | 365h 10m | - |
| United Utilities | BIRKENHEAD WWTW | River Mersey Estuary/River Birket | 34 | 194h 8m | - |
| United Utilities | Noctorum Avenue CSO | River Fender | 43 | 89h 30m | - |
| United Utilities | Woodside CSO | Mersey Estuary | 14 | 56h 20m | - |
| United Utilities | Pool Lane CSO (512L8) | Fender | 3 | 47h 3m | 3,218 h |
| United Utilities | Bidston Bypass CSO | River Birkett | 14 | 44h 6m | 2,408 h |
| United Utilities | BIRKENHEAD WWTW | River Mersey Estuary/River Birket | 9 | 32h 25m | - |
| United Utilities | Stanton Road PS | Boardman Brook | 4 | 28h | - |
| United Utilities | St Pauls Road CSO | River Ribble Estuary | 24 | 25h 46m | 0 h |
| United Utilities | Woodside CSO | Mersey Estuary | 2 | 5h | - |
| United Utilities | Noctorum Avenue CSO | River Fender | 3 | 2h 20m | - |
| United Utilities | St Pauls Road CSO | River Ribble Estuary | 3 | 1h 52m | - |
| United Utilities | Bidston Bypass CSO | River Birkett | 1 | 0h 2m | - |
| United Utilities | Pool Lane CSO (512L8) | Fender | 0 | 0h | 3,411 h |
| United Utilities | Stanton Road PS | Boardman Brook | 0 | 0h | - |
| United Utilities | BIRKENHEAD WWTW | River Mersey Estuary/River Birket | 0 | 0h | - |
| United Utilities | BIRKENHEAD WWTW | River Mersey Estuary/River Birket | 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