Trehembourne SPS Pscsoeo St Merryn
Storm overflow operated by South West Water. The source names Treyarnon Stream as the receiving water.
- 22
- Spills in 2025
- 140.1
- Recorded hours
- 100%
- Monitor operation
- 5
- Years listed
The reported spill count was 8 higher than in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
Trehembourne SPS Pscsoeo St Merryn recorded 22 spills in 2025. That is more than 65% of the 14,239 overflows in England with a reported figure, and ranks 4,697th nationally. Among South West Water overflows it ranks 667th of 1,357; the median South West Water overflow recorded 21 spills.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 22 | 140.1 |
| England | 4,697th of 14,239 | 11 | 22.3 |
| South West Water | 667th 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 | 22 | 140.1 hours | 100% | Official data |
| 2024 | 14 | 74.2 hours | 100% | Official data |
| 2023 | 18 | 72.5 hours | 100% | Official data |
| 2022 | 9 | 21.6 hours | 100% | Official data |
| 2021 | 2 | 0.6 hours | 100% | 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 discharge at a pumping station
- Permit
- 300016
- Activity reference
- A1
- Grid reference
- SW87267330
- 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 “Storm discharge at pumping station”: storm discharge at a pumping station. The overflow is at a pumping station that moves sewage through the network.
Where it is
The recorded position is about 1 km west of the St Merryn reference point in the ONS built-up areas data.
Designated bathing waters within 3 km in a straight line:
Distance does not show that water from this outlet reaches a bathing water. Check the official bathing-water profile for its classification and advice.
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 Merryn CSO St MerrynCurrent status unknown
South West Water · Mother Iveys Bay (C)
- Watergate SPS Pscsoeo Watergate BayCurrent status unknown
South West Water · Stream/ATLANTIC Ocean (S)
- Gusti Veor CSO NewquayCurrent status unknown
South West Water · Unnamed Ditch,TRENANCE Lake(S)
- Towan Head SPS Pscsoeo NewquayCurrent status unknown
South West Water · Atlantic Ocean(T)
Questions about Trehembourne SPS Pscsoeo St Merryn
- Who operates Trehembourne SPS Pscsoeo St Merryn?
- South West Water is the operator named in the annual record. The permit reference is 300016.
- Where does Trehembourne SPS Pscsoeo St Merryn discharge?
- The source names Treyarnon Stream as the receiving water. This does not show how far a discharge travelled.
- How many times did Trehembourne SPS Pscsoeo St Merryn spill in 2025?
- The 2025 return records 22 counted spill events and 140.1 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 100% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Trehembourne SPS Pscsoeo St Merryn 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 Trehembourne SPS Pscsoeo St Merryn?
- The annual return lists the asset type as “Storm discharge at pumping station”, which means storm discharge at a pumping station. The overflow is at a pumping station that moves sewage through the network.
- How does Trehembourne SPS Pscsoeo St Merryn compare with other overflows?
- Trehembourne SPS Pscsoeo St Merryn recorded 22 spills in 2025. That is more than 65% of the 14,239 overflows in England with a reported figure, and ranks 4,697th nationally. Among South West Water overflows it ranks 667th 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.