St Andrew's Road/St Michael's Road CSO
Storm overflow operated by United Utilities. The source names Mersey Estuary as the receiving water.
- 58
- Spills in 2025
- 154.1
- Recorded hours
- 92.9%
- Monitor operation
- 2
- Years listed
The reported spill count was 15 lower than in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
St Andrew's Road/St Michael's Road CSO recorded 58 spills in 2025. That is more than 91% of the 14,239 overflows in England with a reported figure, and ranks 1,191st nationally. Among United Utilities overflows it ranks 333rd of 2,270; the median United Utilities overflow recorded 15 spills. On the MERSEY MOUTH - transitional waterbody it ranks 4th of 23.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 58 | 154.1 |
| England | 1,191st of 14,239 | 11 | 22.3 |
| United Utilities | 333rd of 2,270 | 15 | 29.1 |
| MERSEY MOUTH - transitional | 4th of 23 | 22 | 45.4 |
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
| Year | Spills | Duration | Monitor operation | Source |
|---|---|---|---|---|
| 2025 | 58 | 154.1 hours | 92.9% | Official data |
| 2024 | 73 | 217 hours | 99.2% | Official 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
- 01SEF0012
- Activity reference
- A1
- Grid reference
- SD2955001654
- Waterbody ID
- GB641211630001Official 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 2.1 km south of the Hightown (Sefton) 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.
Open official source ↗Other outlet records nearby
- St Michaels Road/Manor Road CSOCurrent status unknown
United Utilities · River Alt (tidal)
- Dibbs Lane CSOCurrent status unknown
United Utilities · Mersey Estuary
- O/S 32 Hall Road East CSOCurrent status unknown
United Utilities · River Mersey Estuary
- Outside 49 St Andrews Road CSOCurrent status unknown
United Utilities · Mersey Estuary
Questions about St Andrew's Road/St Michael's Road CSO
- Who operates St Andrew's Road/St Michael's Road CSO?
- United Utilities is the operator named in the annual record. The permit reference is 01SEF0012.
- Where does St Andrew's Road/St Michael's Road CSO discharge?
- The source names Mersey Estuary as the receiving water. This does not show how far a discharge travelled.
- How many times did St Andrew's Road/St Michael's Road CSO spill in 2025?
- The 2025 return records 58 counted spill events and 154.1 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 92.9% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is St Andrew's Road/St Michael's Road 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 St Andrew's Road/St Michael's Road 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 St Andrew's Road/St Michael's Road CSO compare with other overflows?
- St Andrew's Road/St Michael's Road CSO recorded 58 spills in 2025. That is more than 91% of the 14,239 overflows in England with a reported figure, and ranks 1,191st nationally. Among United Utilities overflows it ranks 333rd of 2,270; the median United Utilities overflow recorded 15 spills. On the MERSEY MOUTH - transitional waterbody it ranks 4th of 23. 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.