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Polluted by sewage 967 times in 2025 - lasting 5,228 hours
North Wirral (East) was the #6 most polluted shellfish area in England & Wales, by duration of sewage overflows, as reported by the water companies
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Donate NowHere are all the reported sewage overflow totals for North Wirral (East) in 2025.
We use data from the water companies, but we are seeing many anomalies that make us believe that location information is quite poor. The situation is likely far worse than reported here.
In particular: Totals on this page can differ from totals in the Ranked Shellfish page - number on this page are higher - this is due to a lack of standardization on shellfish area names. This page more accurately counts the differing names. For example "Solway" and "SOLWAY" are counted as different in the rankings, but correctly aggregated here.
Other CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s may also be located nearby, however the water companies claim that these do not affect the water quality here.
| Company | Waterway | Site | Sewage Dumps | Duration (Hours) | Reporting % |
|---|---|---|---|---|---|
| United Utilities | River Mersey Estuary | BROMBOROUGH WWTW | 122 | 1,426 | 100 |
| United Utilities | River Mersey Estuary/River Birket | BIRKENHEAD WWTW BIRKE | 105 | 1,272 | 100 |
| United Utilities | River Mersey Estuary | BROMBOROUGH WWTW | 94 | 665 | 99.9 |
| United Utilities | River Alt | ST MICHAELS ROAD/MANOR ROAD CSO | 80 | 412 | 79.8 |
| United Utilities | River Mersey Estuary | MAYFIELD DRIVE PS1 CSO 512EZ | 79 | 402 | 100 |
| United Utilities | Mersey Estuary | THE DELL COMBINED SEWER OVERFLOW | 50 | 157 | 100 |
| United Utilities | Mersey Estuary | ST ANDREWS ROAD/ST MICHAEL CSO | 58 | 154 | 92.8 |
| United Utilities | Arrowe Brook River Birket | ARROWE BROOK LANE CSO | 36 | 128 | 98.7 |
| United Utilities | Prenton Brook | BARNSTON STORM TANK 51070 | 18 | 108 | 99.9 |
| United Utilities | River Fender | HOYLAKE ROAD/CHAPELHILL CSO | 26 | 93 | 89.4 |
| United Utilities | Bidston Stream | LEASOWE ROAD CSO | 53 | 91 | 99.7 |
| United Utilities | Bidston Stream | SANDY LANE CSO | 61 | 77 | 100 |
| United Utilities | Mersey Estuary | WALLACRE ROAD CSO | 31 | 56 | 100 |
| United Utilities | River Birkett | BIDSTON BY-PASS CSO | 13 | 47 | 72.4 |
| United Utilities | Mersey Estuary | BANKHALL RELIEF CSO 99006 | 20 | 39 | 100 |
| United Utilities | Mersey Estuary | EASTHAM VILLAGE CSO | 25 | 29 | 99.8 |
| United Utilities | Mersey Estuary | THERMAL ROAD/PORT CAUSEWAY CSO | 22 | 23 | 99.8 |
| United Utilities | River Mersey Estuarine Waters | BANKHALL RELIEF CSO 99005 | 7 | 10 | 100 |
| United Utilities | River Mersey Estuary | FULWOOD CSO | 7 | 4 | 100 |
| United Utilities | River Mersey Estuary | BEACONS GUTTER SSO | 10 | 4 | 100 |
| United Utilities | Bidston Stream | STATION RD COMBINED SEWER OVERFLOW | 6 | 3 | 99.4 |
| United Utilities | River Mersey Estuary | RIMROSE BROOK CSO | 10 | 3 | 100 |
| United Utilities | Mersey Estuary | ST NICHOLAS STORM SEWER OVERFLOW | 7 | 3 | 100 |
| United Utilities | River Mersey Estuary | BOOTLE NORTHERN OPC CSO 99102 | 9 | 2 | 100 |
| United Utilities | Bidston Stream | WALLACRE ROAD/BEAUFORT DRIVE CSO | 4 | 2 | 100 |
| United Utilities | Mersey Estuary | BROMBOROUGH POOL VILLAGE PS 51026 | 1 | 1 | 100 |
| United Utilities | Mersey Estuary | SANDHILLS LANE CSO | 3 | 1 | 100 |
| United Utilities | River Mersey | BANKHALL CSO 99007 LIV0038 | 6 | 1 | 100 |
| United Utilities | River Mersey | STRAND ROAD STORM SEWER OVERFLOW | 2 | 1 | 100 |
| United Utilities | Mersey Estuary | BATTERY LANE CSO | 2 | 0 | 100 |
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
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