Yeo Mill STW So West Anstey

Storm overflow operated by South West Water. The source names River Yeo as the receiving water.

12
Spills in 2025: 37.1
Recorded hours: 84.8%
Monitor operation: 5
Years listed

Current status unknown

Checking the latest monitor report…

How it compares in 2025

Yeo Mill STW So West Anstey recorded 12 spills in 2025. That is more than 51% of the 14,239 overflows in England with a reported figure, and ranks 6,643rd nationally. Among South West Water overflows it ranks 819th of 1,357; the median South West Water overflow recorded 21 spills.

The monitor worked for 84.8% of 2025, so this count may be low and its rank may understate activity.

Group	Rank by spills	Median spills	Median hours
This outlet	–	12	37.1
England	6,643rd of 14,239	11	22.3
South West Water	819th 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 2022 to 2025, the reported count went from 0 to 12 spills. The highest count was 32 in 2023 and the lowest was 0 in 2022. The monitor worked for less than 90% of 2023, 2024, 2025, so those counts 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	12	37.1 hours	84.8%Low coverage	Official data
2024	3	1.1 hours	20.7%Low coverage	Official data
2023	32	161.3 hours	83.2%Low coverage	Official data
2022	0	0 hours	100%	Official data
2021	Unknown	Unknown	Unknown	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: Inlet storm overflow at a wastewater treatment works
Permit: 202999
Activity reference: A2
Grid reference: SS84162639
Waterbody ID: GB108050014140Official 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 “Inlet SO at WwTW”: inlet storm overflow at a wastewater treatment works. The overflow is at the inlet of a treatment works, where wastewater enters the works.

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 7.6 km west of the Dulverton reference point in the ONS built-up areas data.

Area and water pages

Yeo (Molland) 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

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East Street CSO North Molton
South West Water · River. Mole (S)
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Exford STW So Exford
South West Water · River Exe
Current status unknown

Questions about Yeo Mill STW So West Anstey

Who operates Yeo Mill STW So West Anstey?: South West Water is the operator named in the annual record. The permit reference is 202999.
Where does Yeo Mill STW So West Anstey discharge?: The source names River Yeo as the receiving water. This does not show how far a discharge travelled.
How many times did Yeo Mill STW So West Anstey spill in 2025?: The 2025 return records 12 counted spill events and 37.1 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 84.8% of the reporting period. Below 90%, some events can be missed, so the count and hours may understate activity.
Is Yeo Mill STW So West Anstey 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 Yeo Mill STW So West Anstey?: The annual return lists the asset type as “Inlet SO at WwTW”, which means inlet storm overflow at a wastewater treatment works. The overflow is at the inlet of a treatment works, where wastewater enters the works.
How does Yeo Mill STW So West Anstey compare with other overflows?: Yeo Mill STW So West Anstey recorded 12 spills in 2025. That is more than 51% of the 14,239 overflows in England with a reported figure, and ranks 6,643rd nationally. Among South West Water overflows it ranks 819th 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.