It's a Dirty Business

Watch Channel 4's documentary about the state of the water industry.

Wallasey - 2025 Sewage

Polluted by sewage 1,972 hours in 2025 , monitoring offline 6,593 hours , potential overflows 51 hours

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Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024

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✔ means we have live data (𝑥 if not)

View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Wallasey for 2025. It is an estimate, based on very poor quality live data from the Water Companies. This may not align with the 'official' reported sewage values from the water companies, which is reported in April following then end of the year - so 2025 numbers are reported in April 2026.

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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Constituencies near Wallasey

Daily Data

Jan - 659 hours , 1 potential
Feb - 16 hours , 0 offline
Mar - 29 hours , 2 potential
Apr - 18 hours , 115 offline
May - 49 hours , 418 offline
Jun - 117 hours , 469 offline
Jul - 34 hours , 0 potential
Aug - 9 hours , 46 potential
Sept - 275 hours , 0 potential
Oct - 147 hours , 0 potential
Nov - 440 hours , 1,440 offline
Dec - 174 hours , 618 offline
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
United Utilities Wallasey PS River Mersey Estuary 114 581 h 40m 3 h
United Utilities The rear of 25 Wheatfield Close CSO River Fender 37 205 h 24m 37 h
United Utilities Wallasey PS River Mersey Estuary 27 172 h 32m -
United Utilities Wastdale Drive CSO Arrowe Brook 31 163 h 24m -
United Utilities Upton Storm Tanks River Fender 15 158 h 17m -
United Utilities Wallasey PS River Mersey Estuary 40 116 h 15m -
United Utilities Hoylake Road/Chapelhill Road CSO River Fender 23 87 h 50m 887 h
United Utilities Leasowe Road CSO Bidston Stream 43 74 h 46m 46 h
United Utilities Sandy Lane CSO Bidston Stream 41 58 h 36m -
United Utilities The rear of 25 Wheatfield Close CSO River Fender 9 52 h 6m -
United Utilities Wallacre Road CSO Mersey Estuary 20 50 h 44m -
United Utilities Upton Road CSO River Fender 24 39 h 32m 44 h
United Utilities Saughall Massie Road / Devonshire Road CSO Arrowe Brook 10 39 h 2m 48 h
United Utilities Upton Storm Tanks River Fender 4 35 h 23m -
United Utilities Wallasey PS River Mersey Estuary 8 22 h 54m -
United Utilities 389 Hoylake Road CSO Arrowe Brook 6 19 h 18m 6 h
United Utilities Wastdale Drive CSO Arrowe Brook 5 15 h 9m -
United Utilities Leasowe Road CSO Bidston Stream 8 13 h 1m -
United Utilities Sandy Lane CSO Bidston Stream 8 11 h 15m -
United Utilities 97 Wood Lane CSO Arrowe Brook 9 9 h 25m -
United Utilities New Brighton PS Tidal River Mersey 3 6 h 19m 8 h
United Utilities Wallacre Road CSO Mersey Estuary 5 5 h 59m -
United Utilities Garrick Avenue CSO Arrowe Brook 2 5 h 54m 38 h
United Utilities Hoylake Road/Chapelhill Road CSO River Fender 4 5 h 48m -
United Utilities Acton Lane CSO Arrowe Brook 2 5 h 36m -
United Utilities Upton Road CSO River Fender 3 3 h 48m -
United Utilities Briscoe Drive CSO River Fender 3 3 h 44m 5 h
United Utilities Station Road CSO Bidston Stream 4 2 h 38m 0 h
United Utilities Wallacre Road/Beaufort Drive CSO Bidston Stream 2 1 h 40m -
United Utilities Wallacre Road/Beaufort Drive CSO Bidston Stream 2 1 h -
United Utilities 97 Wood Lane CSO Arrowe Brook 1 0 h 40m -
United Utilities Briscoe Drive CSO River Fender 1 0 h 38m -
United Utilities Kingfisher Way CSO Arrowe Brook 1 0 h 34m -
United Utilities Beechwood Avenue CSO Bidston Stream 1 0 h 32m 36 h
United Utilities Station Road CSO Bidston Stream 1 0 h 25m -
United Utilities Stanley Green Avenue/Green Lane CSO River Birket 1 0 h 24m 0 h
United Utilities Saughall Massie Road / Devonshire Road CSO Arrowe Brook 1 0 h 22m -
United Utilities Stanley Green Avenue/Green Lane CSO River Birket 1 0 h 16m -
United Utilities Wood Lane/ Glentree Close CSO Arrowe Brook River Birkett 0 0 h 2,583 h
United Utilities Wood Lane/ Glentree Close CSO Arrowe Brook River Birkett 0 0 h 2,855 h
United Utilities Wallasey Detention Tank River Mersey Estuary 0 0 h -
United Utilities Garrick Avenue CSO Arrowe Brook 0 0 h -
United Utilities Maryland Lane CSO Arrowe Brook 0 0 h 40 h
United Utilities Acton Lane CSO Arrowe Brook 0 0 h -
United Utilities New Brighton PS Tidal River Mersey 0 0 h -
United Utilities Wallasey Detention Tank River Mersey Estuary 0 0 h -
United Utilities Beechwood Avenue CSO Bidston Stream 0 0 h -
United Utilities Maryland Lane CSO Arrowe Brook 0 0 h -
United Utilities Kingfisher Way CSO Arrowe Brook 0 0 h -
United Utilities 389 Hoylake Road CSO Arrowe Brook 0 0 h -

Data Sources & Accuracy

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.