Ashreigney STW So Ashreigney

Storm overflow operated by South West Water. The source names Tributary of Mully Brook as the receiving water.

167
Spills in 2025: 1,511.3
Recorded hours: 97.1%
Monitor operation: 3
Years listed

Current status unknown

Checking the latest monitor report…

How it compares in 2025

Ashreigney STW So Ashreigney recorded 167 spills in 2025. That is more than 99% of the 14,239 overflows in England with a reported figure, and ranks 17th nationally. Among South West Water overflows it ranks 11th of 1,357; the median South West Water overflow recorded 21 spills. On the Mully Brook waterbody it ranks 1st of 3.

Group	Rank by spills	Median spills	Median hours
This outlet	–	167	1,511.3
England	17th of 14,239	11	22.3
South West Water	11th of 1,357	21	39.4
Mully Brook	1st of 3	127	588.2

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 2023 to 2025, the reported count went from 13 to 167 spills. The highest count was 167 in 2025 and the lowest was 13 in 2023. The monitor worked for less than 90% of 2023, 2024, 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	167	1,511.3 hours	97.1%	Official data
2024	128	1,317.5 hours	74.9%Low coverage	Official data
2023	13	10.7 hours	37.3%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: Inlet storm overflow at a wastewater treatment works
Permit: NRA-SW-1006
Activity reference: A1
Grid reference: SS62071383
Waterbody ID: GB108050014310Official 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 4.6 km north of the Winkleigh reference point in the ONS built-up areas data.

Area and water pages

Mully Brook 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

Riddlecombe S T STW So Riddlecombe
South West Water · Tributary of Mully Brook(S)
Current status unknown

Burrington CSO Burrington
South West Water · Tributary of River Taw(S)
Current status unknown
Burrington STW So Burrington
South West Water · Tributary of Mully Brook
Current status unknown
Wembworthy New STW So Wembworthy
South West Water · The Labdon Stream(S)
Current status unknown

Questions about Ashreigney STW So Ashreigney

Who operates Ashreigney STW So Ashreigney?: South West Water is the operator named in the annual record. The permit reference is NRA-SW-1006.
Where does Ashreigney STW So Ashreigney discharge?: The source names Tributary of Mully Brook as the receiving water. This does not show how far a discharge travelled.
How many times did Ashreigney STW So Ashreigney spill in 2025?: The 2025 return records 167 counted spill events and 1,511.3 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 97.1% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
Is Ashreigney STW So Ashreigney 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 Ashreigney STW So Ashreigney?: 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 Ashreigney STW So Ashreigney compare with other overflows?: Ashreigney STW So Ashreigney recorded 167 spills in 2025. That is more than 99% of the 14,239 overflows in England with a reported figure, and ranks 17th nationally. Among South West Water overflows it ranks 11th of 1,357; the median South West Water overflow recorded 21 spills. On the Mully Brook waterbody it ranks 1st of 3. 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.