Haye Road CSO Callington

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

77
Spills in 2025: 462.1
Recorded hours: 99.6%
Monitor operation: 5
Years listed

The reported spill count was 2 lower than in 2024. This compares event counts, not discharge volume.

Current status unknown

Checking the latest monitor report…

How it compares in 2025

Haye Road CSO Callington recorded 77 spills in 2025. That is more than 95% of the 14,239 overflows in England with a reported figure, and ranks 565th nationally. Among South West Water overflows it ranks 172nd of 1,357; the median South West Water overflow recorded 21 spills. On the Lower River Lynher waterbody it ranks 2nd of 9.

Group	Rank by spills	Median spills	Median hours
This outlet	–	77	462.1
England	565th of 14,239	11	22.3
South West Water	172nd of 1,357	21	39.4
Lower River Lynher	2nd of 9	33	452.6

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 60 to 77 spills. The highest count was 89 in 2023 and the lowest was 60 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	77	462.1 hours	99.6%	Official data
2024	79	266.9 hours	95.5%	Official data
2023	89	393 hours	100%	Official data
2022	68	218.2 hours	91%	Official data
2021	60	142.7 hours	70%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: 303530
Activity reference: A1
Grid reference: SX35016989
Waterbody ID: GB108047007670Official waterbody record ↗
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.

The waterbody link opens the Environment Agency record for the exact ID in the return. It is a source lookup; we do not import its classification.

Where it is

The recorded position is about 1.3 km west of the Callington reference point in the ONS built-up areas data.

Area and water pages

Lower River Lynher waterbody →

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

Callington STW SSO Callington
South West Water · Haye Valley Stream
Current status unknown

Golberdon STW So Golberdon
South West Water · River Lynher
Current status unknown
Stoke Climsland STW So Stoke Climsland
South West Water · (S) Luckett Stream
Current status unknown
Old Mill Spst Pscsoeo Stoke Climsland
South West Water · Alren Stream
Current status unknown

Questions about Haye Road CSO Callington

Who operates Haye Road CSO Callington?: South West Water is the operator named in the annual record. The permit reference is 303530.
Where does Haye Road CSO Callington discharge?: The source names Haye Valley Stream as the receiving water. This does not show how far a discharge travelled.
How many times did Haye Road CSO Callington spill in 2025?: The 2025 return records 77 counted spill events and 462.1 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 99.6% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
Is Haye Road CSO Callington 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 Haye Road CSO Callington?: 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 Haye Road CSO Callington compare with other overflows?: Haye Road CSO Callington recorded 77 spills in 2025. That is more than 95% of the 14,239 overflows in England with a reported figure, and ranks 565th nationally. Among South West Water overflows it ranks 172nd of 1,357; the median South West Water overflow recorded 21 spills. On the Lower River Lynher waterbody it ranks 2nd of 9. 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.