Trefusis Park CSO Plymouth
Storm overflow operated by South West Water. The source names Tributary of the River Plym as the receiving water.
- 42
- Spills in 2025
- 31.3
- Recorded hours
- 86.6%
- Monitor operation
- 5
- Years listed
Checking the latest monitor report…
How it compares in 2025
Trefusis Park CSO Plymouth recorded 42 spills in 2025. That is more than 83% of the 14,239 overflows in England with a reported figure, and ranks 2,238th nationally. Among South West Water overflows it ranks 410th of 1,357; the median South West Water overflow recorded 21 spills.
The monitor worked for 86.6% of 2025, so this count may be low and its rank may understate activity.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 42 | 31.3 |
| England | 2,238th of 14,239 | 11 | 22.3 |
| South West Water | 410th 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 | 42 | 31.3 hours | 86.6%Low coverage | Official data |
| 2024 | 51 | 29.3 hours | 100% | Official data |
| 2023 | 52 | 32.2 hours | 100% | Official data |
| 2022 | 42 | 22.3 hours | 100% | Official data |
| 2021 | 64 | 61.6 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 overflow on the sewer network
- Permit
- 301709
- Activity reference
- A1
- Grid reference
- SX49385585
- 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 1.5 km south of the Plymouth 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.
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
- Lipson Vale 1 CSO PlymouthCurrent status unknown
South West Water · Tributary of the River Plym via SWS
- Lipson Vale 2 CSO PlymouthCurrent status unknown
South West Water · Tributary of the River Plym via SWS
- Arnolds Point SPS Pscsoeo PlymouthCurrent status unknown
South West Water · River Plym via SWS (Estuarine)
- Field O/S 32 Laira Park Gdn CSO PlymouthCurrent status unknown
South West Water · River Plym via SWS (Estuarine)
Questions about Trefusis Park CSO Plymouth
- Who operates Trefusis Park CSO Plymouth?
- South West Water is the operator named in the annual record. The permit reference is 301709.
- Where does Trefusis Park CSO Plymouth discharge?
- The source names Tributary of the River Plym as the receiving water. This does not show how far a discharge travelled.
- How many times did Trefusis Park CSO Plymouth spill in 2025?
- The 2025 return records 42 counted spill events and 31.3 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 86.6% of the reporting period. Below 90%, some events can be missed, so the count and hours may understate activity.
- Is Trefusis Park CSO Plymouth 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 Trefusis Park CSO Plymouth?
- 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 Trefusis Park CSO Plymouth compare with other overflows?
- Trefusis Park CSO Plymouth recorded 42 spills in 2025. That is more than 83% of the 14,239 overflows in England with a reported figure, and ranks 2,238th nationally. Among South West Water overflows it ranks 410th 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.