HELSBY WwTW, United Utilities (016810187 · A3 · UUP00939)

Storm overflow operated by United Utilities. The source names Hornsmill Brook as the receiving water.

6
Spills in 2025: 19.1
Recorded hours: 100%
Monitor operation: 2
Years listed

The reported spill count was 13 lower than in 2024. This compares event counts, not discharge volume.

Current status unknown

Checking the latest monitor report…

How it compares in 2025

HELSBY WwTW, United Utilities (016810187 · A3 · UUP00939) recorded 6 spills in 2025. That is more than 37% of the 14,239 overflows in England with a reported figure, and ranks 8,498th nationally. Among United Utilities overflows it ranks 1,473rd of 2,270; the median United Utilities overflow recorded 15 spills. On the Peckmill Brook, Hoolpool Gutter at Ince Marshes. waterbody it ranks 3rd of 4.

Group	Rank by spills	Median spills	Median hours
This outlet	–	6	19.1
England	8,498th of 14,239	11	22.3
United Utilities	1,473rd of 2,270	15	29.1
Peckmill Brook, Hoolpool Gutter at Ince Marshes.	3rd of 4	6.5	29.8

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 2024 to 2025, the reported count went from 19 to 6 spills. The highest count was 19 in 2024 and the lowest was 6 in 2025.

Year	Spills	Duration	Monitor operation	Source
2025	6	19.1 hours	100%	Official data
2024	19	142.3 hours	99.5%	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: United Utilities
Outlet type: Inlet storm overflow at a wastewater treatment works
Permit: 016810187
Activity reference: A3
Grid reference: SJ4813974979
Waterbody ID: GB112068060330Official waterbody record ↗
Location source: Official annual grid reference
Location precision: About 1 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 1 km west of the Helsby reference point in the ONS built-up areas data.

Area and water pages

Peckmill Brook, Hoolpool Gutter at Ince Marshes. 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 ↗

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Questions about HELSBY WwTW, United Utilities (016810187 · A3 · UUP00939)

Who operates HELSBY WwTW, United Utilities (016810187 · A3 · UUP00939)?: United Utilities is the operator named in the annual record. The permit reference is 016810187.
Where does HELSBY WwTW, United Utilities (016810187 · A3 · UUP00939) discharge?: The source names Hornsmill Brook as the receiving water. This does not show how far a discharge travelled.
How many times did HELSBY WwTW, United Utilities (016810187 · A3 · UUP00939) spill in 2025?: The 2025 return records 6 counted spill events and 19.1 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 100% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
Is HELSBY WwTW, United Utilities (016810187 · A3 · UUP00939) 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 1 metres. It shows the recorded outlet position, not the extent of any discharge.
What kind of outlet is HELSBY WwTW, United Utilities (016810187 · A3 · UUP00939)?: 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 HELSBY WwTW, United Utilities (016810187 · A3 · UUP00939) compare with other overflows?: HELSBY WwTW, United Utilities (016810187 · A3 · UUP00939) recorded 6 spills in 2025. That is more than 37% of the 14,239 overflows in England with a reported figure, and ranks 8,498th nationally. Among United Utilities overflows it ranks 1,473rd of 2,270; the median United Utilities overflow recorded 15 spills. On the Peckmill Brook, Hoolpool Gutter at Ince Marshes. waterbody it ranks 3rd of 4. 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.