Praze Tank CSO Penryn

Storm overflow operated by South West Water. The source names Praze Stream as the receiving water.

49
Spills in 2025: 663.3
Recorded hours: 93.7%
Monitor operation: 5
Years listed

The reported spill count was 12 lower than in 2024. This compares event counts, not discharge volume.

Current status unknown

Checking the latest monitor report…

How it compares in 2025

Praze Tank CSO Penryn recorded 49 spills in 2025. That is more than 87% of the 14,239 overflows in England with a reported figure, and ranks 1,699th nationally. Among South West Water overflows it ranks 348th of 1,357; the median South West Water overflow recorded 21 spills.

Group	Rank by spills	Median spills	Median hours
This outlet	–	49	663.3
England	1,699th of 14,239	11	22.3
South West Water	348th 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

From 2021 to 2025, the reported count went from 37 to 49 spills. The highest count was 77 in 2023 and the lowest was 37 in 2021. The monitor worked for less than 90% of 2021, so that count may be low.Amber bars mark years when the monitor worked for less than 90% of the year.

Year	Spills	Duration	Monitor operation	Source
2025	49	663.3 hours	93.7%	Official data
2024	61	576.9 hours	100%	Official data
2023	77	726 hours	100%	Official data
2022	37	287.6 hours	100%	Official data
2021	37	282.8 hours	89%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: South West Water
Outlet type: Storm overflow on the sewer network
Permit: 302302
Activity reference: A1
Grid reference: SW78103481
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 0.5 km north-east of the Penryn 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.

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Other outlet records nearby

O/S 58 Thomas St CSO Penryn
South West Water · Tributary of Penryn River(S)
Current status unknown

Commercial Road SPS Pscsoeo Penryn
South West Water · The Penryn River (E)
Current status unknown
Old Hill CSO Falmouth
South West Water · Penryn River(E)
Current status unknown
Old Hill SPS Pscsoeo Falmouth
South West Water · Penryn River(E)
Current status unknown

Questions about Praze Tank CSO Penryn

Who operates Praze Tank CSO Penryn?: South West Water is the operator named in the annual record. The permit reference is 302302.
Where does Praze Tank CSO Penryn discharge?: The source names Praze Stream as the receiving water. This does not show how far a discharge travelled.
How many times did Praze Tank CSO Penryn spill in 2025?: The 2025 return records 49 counted spill events and 663.3 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 93.7% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
Is Praze Tank CSO Penryn 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 Praze Tank CSO Penryn?: 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 Praze Tank CSO Penryn compare with other overflows?: Praze Tank CSO Penryn recorded 49 spills in 2025. That is more than 87% of the 14,239 overflows in England with a reported figure, and ranks 1,699th nationally. Among South West Water overflows it ranks 348th 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.