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Polluted by sewage 2,024 hours in 2025
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We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for Wallasey, here you can see overflows in red, the darker the red, the more the CSO overflowed that day.
Each CSO has a row, the most recent data is on the right hand side.
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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Total Duration (days) |
|---|---|---|---|---|---|
| United Utilities | Wallasey PS | River Mersey Estuary | 114 | 586 h 37m | 24.42 |
| United Utilities | The rear of 25 Wheatfield Close CSO | River Fender | 37 | 205 h 14m | 8.54 |
| United Utilities | Wallasey PS | River Mersey Estuary | 27 | 172 h 32m | 7.17 |
| United Utilities | Wastdale Drive CSO | Arrowe Brook | 31 | 163 h 24m | 6.79 |
| United Utilities | Upton Storm Tanks | River Fender | 15 | 158 h 17m | 6.58 |
| United Utilities | Leasowe Road CSO | Bidston Stream | 45 | 121 h 37m | 5.04 |
| United Utilities | Wallasey PS | River Mersey Estuary | 40 | 116 h 15m | 4.83 |
| United Utilities | Hoylake Road/Chapelhill Road CSO | River Fender | 23 | 87 h 50m | 3.62 |
| United Utilities | Sandy Lane CSO | Bidston Stream | 41 | 58 h 36m | 2.42 |
| United Utilities | The rear of 25 Wheatfield Close CSO | River Fender | 9 | 52 h 6m | 2.17 |
| United Utilities | Wallacre Road CSO | Mersey Estuary | 20 | 50 h 44m | 2.08 |
| United Utilities | Upton Road CSO | River Fender | 24 | 40 h 35m | 1.67 |
| United Utilities | Saughall Massie Road / Devonshire Road CSO | Arrowe Brook | 10 | 39 h 2m | 1.62 |
| United Utilities | Upton Storm Tanks | River Fender | 4 | 35 h 23m | 1.46 |
| United Utilities | Wallasey PS | River Mersey Estuary | 8 | 22 h 54m | 0.92 |
| United Utilities | 389 Hoylake Road CSO | Arrowe Brook | 6 | 18 h 42m | 0.75 |
| United Utilities | Wastdale Drive CSO | Arrowe Brook | 5 | 15 h 9m | 0.62 |
| United Utilities | Leasowe Road CSO | Bidston Stream | 8 | 13 h 1m | 0.54 |
| United Utilities | Sandy Lane CSO | Bidston Stream | 8 | 11 h 15m | 0.46 |
| United Utilities | 97 Wood Lane CSO | Arrowe Brook | 9 | 9 h 25m | 0.38 |
| United Utilities | New Brighton PS | Tidal River Mersey | 3 | 6 h 18m | 0.25 |
| United Utilities | Wallacre Road CSO | Mersey Estuary | 5 | 5 h 59m | 0.21 |
| United Utilities | Garrick Avenue CSO | Arrowe Brook | 2 | 5 h 54m | 0.21 |
| United Utilities | Hoylake Road/Chapelhill Road CSO | River Fender | 4 | 5 h 48m | 0.21 |
| United Utilities | Acton Lane CSO | Arrowe Brook | 2 | 5 h 36m | 0.21 |
| United Utilities | Upton Road CSO | River Fender | 3 | 3 h 48m | 0.12 |
| United Utilities | Briscoe Drive CSO | River Fender | 3 | 3 h 38m | 0.12 |
| United Utilities | Station Road CSO | Bidston Stream | 4 | 2 h 38m | 0.08 |
| United Utilities | Wallacre Road/Beaufort Drive CSO | Bidston Stream | 2 | 1 h 40m | 0.04 |
| United Utilities | Wallacre Road/Beaufort Drive CSO | Bidston Stream | 2 | 1 h | 0.04 |
| United Utilities | 97 Wood Lane CSO | Arrowe Brook | 1 | 0 h 40m | 0 |
| United Utilities | Briscoe Drive CSO | River Fender | 1 | 0 h 38m | 0 |
| United Utilities | Kingfisher Way CSO | Arrowe Brook | 1 | 0 h 34m | 0 |
| United Utilities | Beechwood Avenue CSO | Bidston Stream | 1 | 0 h 32m | 0 |
| United Utilities | Station Road CSO | Bidston Stream | 1 | 0 h 25m | 0 |
| United Utilities | Stanley Green Avenue/Green Lane CSO | River Birket | 1 | 0 h 24m | 0 |
| United Utilities | Saughall Massie Road / Devonshire Road CSO | Arrowe Brook | 1 | 0 h 22m | 0 |
| United Utilities | Stanley Green Avenue/Green Lane CSO | River Birket | 1 | 0 h 16m | 0 |
| United Utilities | New Brighton PS | Tidal River Mersey | 0 | 0 h | 0 |
| United Utilities | Wood Lane/ Glentree Close CSO | Arrowe Brook River Birkett | 0 | 0 h | 0 |
| United Utilities | 389 Hoylake Road CSO | Arrowe Brook | 0 | 0 h | 0 |
| United Utilities | Acton Lane CSO | Arrowe Brook | 0 | 0 h | 0 |
| United Utilities | Maryland Lane CSO | Arrowe Brook | 0 | 0 h | 0 |
| United Utilities | Wallasey Detention Tank | River Mersey Estuary | 0 | 0 h | 0 |
| United Utilities | Wallasey Detention Tank | River Mersey Estuary | 0 | 0 h | 0 |
| United Utilities | Kingfisher Way CSO | Arrowe Brook | 0 | 0 h | 0 |
| United Utilities | Wood Lane/ Glentree Close CSO | Arrowe Brook River Birkett | 0 | 0 h | 0 |
| United Utilities | Maryland Lane CSO | Arrowe Brook | 0 | 0 h | 0 |
| United Utilities | Garrick Avenue CSO | Arrowe Brook | 0 | 0 h | 0 |
| United Utilities | Beechwood Avenue CSO | Bidston Stream | 0 | 0 h | 0 |
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