Clifford Avenue CSO
Storm overflow operated by United Utilities. The source names Longton Brook as the receiving water.
- 21
- Spills in 2025
- 101.2
- Recorded hours
- 99.1%
- Monitor operation
- 2
- Years listed
The reported spill count was 18 lower than in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
Clifford Avenue CSO recorded 21 spills in 2025. That is more than 64% of the 14,239 overflows in England with a reported figure, and ranks 4,856th nationally. Among United Utilities overflows it ranks 981st of 2,270; the median United Utilities overflow recorded 15 spills. On the RIBBLE_Transitional waterbody it ranks 14th of 52.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 21 | 101.2 |
| England | 4,856th of 14,239 | 11 | 22.3 |
| United Utilities | 981st of 2,270 | 15 | 29.1 |
| RIBBLE_Transitional | 14th of 52 | 7.5 | 17.8 |
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 | 21 | 101.2 hours | 99.1% | Official data |
| 2024 | 39 | 239.2 hours | 94.3% | 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
- 017081289
- Activity reference
- A1
- Grid reference
- SD4813426371
- Waterbody ID
- GB531207112400Official 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 north of the Longton 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
- The Greenacres CSOCurrent status unknown
United Utilities · Unnamed tributary of Mill Brook
- Preston Network Terminal Pumping Station (Site ID HOWCK) (PRE0125)Current status unknown
United Utilities · River Ribble (Tidal)
- Watery Lane/Douglas Street CSOCurrent status unknown
United Utilities · Chain Caul Culvert Into Ribble
- Watery Lane PS CSOCurrent status unknown
United Utilities · River Ribble
Questions about Clifford Avenue CSO
- Who operates Clifford Avenue CSO?
- United Utilities is the operator named in the annual record. The permit reference is 017081289.
- Where does Clifford Avenue CSO discharge?
- The source names Longton Brook as the receiving water. This does not show how far a discharge travelled.
- How many times did Clifford Avenue CSO spill in 2025?
- The 2025 return records 21 counted spill events and 101.2 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 99.1% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Clifford Avenue 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 Clifford Avenue 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 Clifford Avenue CSO compare with other overflows?
- Clifford Avenue CSO recorded 21 spills in 2025. That is more than 64% of the 14,239 overflows in England with a reported figure, and ranks 4,856th nationally. Among United Utilities overflows it ranks 981st of 2,270; the median United Utilities overflow recorded 15 spills. On the RIBBLE_Transitional waterbody it ranks 14th of 52. 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.