Sewage Map

Hayle STW SSO Hayle

Storm overflow operated by South West Water. The source names Atlantic (C) as the receiving water.

49
Spills in 2025
474.6
Recorded hours
100%
Monitor operation
5
Years listed

The reported spill count was 16 lower than in 2024. This compares event counts, not discharge volume.

Current status unknown

Checking the latest monitor report…

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How it compares in 2025

Hayle STW SSO Hayle 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.

GroupRank by spillsMedian spillsMedian hours
This outlet–49474.6
England1,699th of 14,2391122.3
South West Water348th of 1,3572139.4

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

452021622022962023652024492025
From 2021 to 2025, the reported count went from 45 to 49 spills. The highest count was 96 in 2023 and the lowest was 45 in 2021. The monitor worked for less than 90% of 2021, 2022, so those counts may be low.Amber bars mark years when the monitor worked for less than 90% of the year.
YearSpillsDurationMonitor operationSource
202549474.6 hours100%Official data
202465817.9 hours100%Official data
2023961,383.2 hours100%Official data
202262584.1 hours42%Low coverageOfficial data
202145426.1 hours56%Low coverageOfficial 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 tank at a wastewater treatment works
Permit
NRA-SW-0782
Activity reference
A2
Grid reference
SW55934326
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 tank at WwTW”: storm tank at a wastewater treatment works. The overflow comes from storm storage at a treatment works.

Where it is

The recorded position is about 5 km north of the The Towans 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

Questions about Hayle STW SSO Hayle

Who operates Hayle STW SSO Hayle?
South West Water is the operator named in the annual record. The permit reference is NRA-SW-0782.
Where does Hayle STW SSO Hayle discharge?
The source names Atlantic (C) as the receiving water. This does not show how far a discharge travelled.
How many times did Hayle STW SSO Hayle spill in 2025?
The 2025 return records 49 counted spill events and 474.6 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 Hayle STW SSO Hayle 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 Hayle STW SSO Hayle?
The annual return lists the asset type as “Storm tank at WwTW”, which means storm tank at a wastewater treatment works. The overflow comes from storm storage at a treatment works.
How does Hayle STW SSO Hayle compare with other overflows?
Hayle STW SSO Hayle 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.