The Bypass / Liverpool Road Junction CSO
Storm overflow operated by United Utilities. The source names Mersey Estuary as the receiving water.
- 9
- Spills in 2025
- 4.6
- Recorded hours
- 76.4%
- Monitor operation
- 2
- Years listed
Checking the latest monitor report…
How it compares in 2025
The Bypass / Liverpool Road Junction CSO recorded 9 spills in 2025. That is more than 45% of the 14,239 overflows in England with a reported figure, and ranks 7,492nd nationally. Among United Utilities overflows it ranks 1,327th of 2,270; the median United Utilities overflow recorded 15 spills. On the MERSEY MOUTH - transitional waterbody it ranks 15th of 23.
The monitor worked for 76.4% of 2025, so this count may be low and its rank may understate activity.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 9 | 4.6 |
| England | 7,492nd of 14,239 | 11 | 22.3 |
| United Utilities | 1,327th of 2,270 | 15 | 29.1 |
| MERSEY MOUTH - transitional | 15th 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 | 9 | 4.6 hours | 76.4%Low coverage | Official data |
| 2024 | 5 | 2.9 hours | 26.4%Low coverage | 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
- 016982752
- Activity reference
- A1
- Grid reference
- SJ3050098906
- 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 1.8 km west of the Crosby (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
- Opposite 53 Moor Lane (in roundabout) Combined Sewer Overflow (Site ID 382G6) (SEF0097)Current status unknown
United Utilities · Mersey Estuary
- 51 Moor Lane CSOCurrent status unknown
United Utilities · Mersey Estuary
- O/S 16 Coronation RoadCurrent status unknown
United Utilities · River Mersey Estuary
- O/S 107 Liverpool Road in Footpath CSOCurrent status unknown
United Utilities · Mersey Estuary
Questions about The Bypass / Liverpool Road Junction CSO
- Who operates The Bypass / Liverpool Road Junction CSO?
- United Utilities is the operator named in the annual record. The permit reference is 016982752.
- Where does The Bypass / Liverpool Road Junction CSO discharge?
- The source names Mersey Estuary as the receiving water. This does not show how far a discharge travelled.
- How many times did The Bypass / Liverpool Road Junction CSO spill in 2025?
- The 2025 return records 9 counted spill events and 4.6 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 76.4% of the reporting period. Below 90%, some events can be missed, so the count and hours may understate activity.
- Is The Bypass / Liverpool Road Junction 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 The Bypass / Liverpool Road Junction 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 The Bypass / Liverpool Road Junction CSO compare with other overflows?
- The Bypass / Liverpool Road Junction CSO recorded 9 spills in 2025. That is more than 45% of the 14,239 overflows in England with a reported figure, and ranks 7,492nd nationally. Among United Utilities overflows it ranks 1,327th of 2,270; the median United Utilities overflow recorded 15 spills. On the MERSEY MOUTH - transitional waterbody it ranks 15th 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.