Sewage Map

French Street CSO

Storm overflow operated by United Utilities. The source names River Mersey via SWS as the receiving water.

43
Spills in 2025
153.5
Recorded hours
100%
Monitor operation
2
Years listed
Current status unknown

Checking the latest monitor report…

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How it compares in 2025

French Street CSO recorded 43 spills in 2025. That is more than 84% of the 14,239 overflows in England with a reported figure, and ranks 2,156th nationally. Among United Utilities overflows it ranks 534th of 2,270; the median United Utilities overflow recorded 15 spills. On the MERSEY - Transitional waterbody it ranks 22nd of 78.

GroupRank by spillsMedian spillsMedian hours
This outlet–43153.5
England2,156th of 14,2391122.3
United Utilities534th of 2,2701529.1
MERSEY - Transitional22nd of 781534.5

Rank 1 has the most spills. Equal counts share a rank. Only overflows with a reported count are ranked. Counts do not measure volume, so a higher rank does not mean more sewage.

Annual spill history

512024432025
From 2024 to 2025, the reported count went from 51 to 43 spills. The highest count was 51 in 2024 and the lowest was 43 in 2025. The monitor worked for less than 90% of 2024, so that count may be low.Amber bars mark years when the monitor worked for less than 90% of the year.
YearSpillsDurationMonitor operationSource
202543153.5 hours100%Official data
202451195.6 hours81.3%Low coverageOfficial data

A missing figure means the source did not provide a usable value. A zero is shown as zero. Monitor operation below 90% can make comparison less reliable.

Outlet details

Water company
United Utilities
Outlet type
Storm overflow on the sewer network
Permit
01HAL0043
Activity reference
A1
Grid reference
SJ5395085222
Waterbody ID
GB531206908100Official waterbody record ↗
Location source
Official annual grid reference
Location precision
About 1 metres
Location note
Unknown

About the name and type

The annual return lists this asset as “SO on sewer network”: storm overflow on the sewer network. The return places this overflow on the sewer network.

The waterbody link opens the Environment Agency record for the exact ID in the return. It is a source lookup; we do not import its classification.

Where it is

The recorded position is about 2.9 km east of the Widnes reference point in the ONS built-up areas data.

Area and water pages

Check the official record

Public access to this outlet is unknown. Do not enter restricted land or use this page as a route guide.

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Other outlet records nearby

Questions about French Street CSO

Who operates French Street CSO?
United Utilities is the operator named in the annual record. The permit reference is 01HAL0043.
Where does French Street CSO discharge?
The source names River Mersey via SWS as the receiving water. This does not show how far a discharge travelled.
How many times did French Street CSO spill in 2025?
The 2025 return records 43 counted spill events and 153.5 hours of recorded discharge. Spills are counted with the 12/24-hour method, so this is not a count of every start signal.
Can I trust the 2025 figures for this outlet?
The monitor worked for 100% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
Is French Street CSO discharging right now?
This record is linked to a company live feed. The panel above shows the latest report we hold, with its date. That report can be old, and the monitor can be offline, so check the date before relying on it. A report that no discharge is taking place is not a water-quality result.
How accurate is the map marker?
The marker comes from the grid reference in the official annual return, which is accurate to about 1 metres. It shows the recorded outlet position, not the extent of any discharge.
What kind of outlet is French Street CSO?
The annual return lists the asset type as “SO on sewer network”, which means storm overflow on the sewer network. The return places this overflow on the sewer network.
How does French Street CSO compare with other overflows?
French Street CSO recorded 43 spills in 2025. That is more than 84% of the 14,239 overflows in England with a reported figure, and ranks 2,156th nationally. Among United Utilities overflows it ranks 534th of 2,270; the median United Utilities overflow recorded 15 spills. On the MERSEY - Transitional waterbody it ranks 22nd of 78. Ranks compare counted spill events only. They do not compare volume or harm.
Does zero spills mean the water was safe?
No. A zero means the annual return recorded zero counted spill events for this outlet and year. It is not a water-quality test, and pollution can come from other sources.