Tehidy Terrace CSO Falmouth

Storm overflow operated by South West Water. The source names Penryn River(E) as the receiving water.

3
Spills in 2025: 0.7
Recorded hours: 92.3%
Monitor operation: 5
Years listed

The reported spill count was 1 higher than in 2024. This compares event counts, not discharge volume.

Current status unknown

Checking the latest monitor report…

How it compares in 2025

Tehidy Terrace CSO Falmouth recorded 3 spills in 2025. That is more than 26% of the 14,239 overflows in England with a reported figure, and ranks 9,843rd nationally. Among South West Water overflows it ranks 1,047th of 1,357; the median South West Water overflow recorded 21 spills.

Group	Rank by spills	Median spills	Median hours
This outlet	–	3	0.7
England	9,843rd of 14,239	11	22.3
South West Water	1,047th 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 9 to 3 spills. The highest count was 9 in 2021 and the lowest was 2 in 2024. The monitor worked for less than 90% of 2022, 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	3	0.7 hours	92.3%	Official data
2024	2	0.4 hours	100%	Official data
2023	6	0.5 hours	100%	Official data
2022	5	0.4 hours	81%Low coverage	Official data
2021	9	2.7 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: 303012
Activity reference: A1
Grid reference: SW80263388
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 west of the Flushing 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.

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Other outlet records nearby

24 North Parade CSO Falmouth
South West Water · Penryn River(E)
Current status unknown

North Parade CSO Falmouth
South West Water · Penryn River
Current status unknown
Greenbank Gardens CSO Falmouth
South West Water · Penryn River(E)
Current status unknown
Old Hill CSO Falmouth
South West Water · Penryn River(E)
Current status unknown

Questions about Tehidy Terrace CSO Falmouth

Who operates Tehidy Terrace CSO Falmouth?: South West Water is the operator named in the annual record. The permit reference is 303012.
Where does Tehidy Terrace CSO Falmouth discharge?: The source names Penryn River(E) as the receiving water. This does not show how far a discharge travelled.
How many times did Tehidy Terrace CSO Falmouth spill in 2025?: The 2025 return records 3 counted spill events and 0.7 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 92.3% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
Is Tehidy Terrace CSO Falmouth 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 Tehidy Terrace CSO Falmouth?: 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 Tehidy Terrace CSO Falmouth compare with other overflows?: Tehidy Terrace CSO Falmouth recorded 3 spills in 2025. That is more than 26% of the 14,239 overflows in England with a reported figure, and ranks 9,843rd nationally. Among South West Water overflows it ranks 1,047th 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.