Media Queries
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Polluted by sewage 990 hours in 2026 , monitoring offline 665 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 | BIRKENHEAD WwTW | River Mersey Estuary/River Birket | 75 | 774h 47m | - |
| United Utilities | BIRKENHEAD WWTW | River Mersey Estuary/River Birket | 29 | 94h 30m | - |
| United Utilities | Bidston Bypass CSO | River Birkett | 18 | 70h 54m | 665 h |
| United Utilities | St Pauls Road CSO | River Ribble Estuary | 23 | 26h 10m | - |
| United Utilities | Woodside CSO | Mersey Estuary | 14 | 23h 4m | - |
| United Utilities | Noctorum Avenue CSO | River Fender | 5 | 1h 26m | - |
| United Utilities | BIRKENHEAD WwTW | River Mersey Estuary/River Birket | 0 | 0h | - |
| United Utilities | BIRKENHEAD WWTW | River Mersey Estuary/River Birket | 0 | 0h | - |
| United Utilities | Pool Lane CSO (512L8) | Fender | 0 | 0h | 0 h |
| United Utilities | Stanton Road PS | Boardman Brook | 0 | 0h | - |
| United Utilities | Noctorum Avenue CSO | River Fender | 0 | 0h | - |
| United Utilities | Woodside CSO | Mersey Estuary | 0 | 0h | - |
| United Utilities | Bidston Bypass CSO | River Birkett | 0 | 0h | - |
| United Utilities | St Pauls Road CSO | River Ribble Estuary | 0 | 0h | - |
| United Utilities | Stanton Road PS | Boardman Brook | 0 | 0h | - |
| United Utilities | BIRKENHEAD WWTW | River Mersey Estuary/River Birket | 0 | 0h | - |
| United Utilities | Pool Lane CSO (512L8) | Fender | 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