Nancherrow Hill CSO St Just
Storm overflow operated by South West Water. The source names Local Stream (S) as the receiving water.
- 30
- Spills in 2025
- 49.7
- Recorded hours
- 93.5%
- Monitor operation
- 5
- Years listed
The reported spill count was 13 lower than in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
Nancherrow Hill CSO St Just recorded 30 spills in 2025. That is more than 74% of the 14,239 overflows in England with a reported figure, and ranks 3,488th nationally. Among South West Water overflows it ranks 553rd of 1,357; the median South West Water overflow recorded 21 spills.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 30 | 49.7 |
| England | 3,488th of 14,239 | 11 | 22.3 |
| South West Water | 553rd of 1,357 | 21 | 39.4 |
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 | 30 | 49.7 hours | 93.5% | Official data |
| 2024 | 43 | 84.3 hours | 97% | Official data |
| 2023 | 60 | 146.3 hours | 100% | Official data |
| 2022 | 2 | 1.8 hours | 100% | Official data |
| 2021 | Unknown | Unknown | Unknown | 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
- South West Water
- Outlet type
- Storm overflow on the sewer network
- Permit
- 301815
- Activity reference
- A1
- Grid reference
- SW36933191
- Waterbody ID
- Unknown
- Location source
- Official annual grid reference
- Location precision
- About 10 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.
Where it is
The recorded position is about 0.7 km north of the St Just reference point in the ONS built-up areas data.
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
- Tregeseal STW So St JustCurrent status unknown
South West Water · Tregaseal Stream (S)
- Botallack Pscsoeo TregesealCurrent status unknown
South West Water · Atlantic Ocean (C)
- Boswedden SPS Pscsoeo Cape CornwallCurrent status unknown
South West Water · Atlantic Ocean
- Bosorne Rd 2 Csoeo St JustCurrent status unknown
South West Water · Atlantic / Porth Nanven Stream
Questions about Nancherrow Hill CSO St Just
- Who operates Nancherrow Hill CSO St Just?
- South West Water is the operator named in the annual record. The permit reference is 301815.
- Where does Nancherrow Hill CSO St Just discharge?
- The source names Local Stream (S) as the receiving water. This does not show how far a discharge travelled.
- How many times did Nancherrow Hill CSO St Just spill in 2025?
- The 2025 return records 30 counted spill events and 49.7 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 93.5% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Nancherrow Hill CSO St Just 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 10 metres. It shows the recorded outlet position, not the extent of any discharge.
- What kind of outlet is Nancherrow Hill CSO St Just?
- 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 Nancherrow Hill CSO St Just compare with other overflows?
- Nancherrow Hill CSO St Just recorded 30 spills in 2025. That is more than 74% of the 14,239 overflows in England with a reported figure, and ranks 3,488th nationally. Among South West Water overflows it ranks 553rd of 1,357; the median South West Water overflow recorded 21 spills. 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.