Calverley East/No 2 CSO

Storm overflow operated by Yorkshire Water. The source names Leeds & Liverpool Canal as the receiving water.

52
Spills in 2025: 83.8
Recorded hours: 94.7%
Monitor operation: 6
Years listed

Current status unknown

Checking the latest monitor report…

How it compares in 2025

Calverley East/No 2 CSO recorded 52 spills in 2025. That is more than 88% of the 14,239 overflows in England with a reported figure, and ranks 1,512th nationally. Among Yorkshire Water overflows it ranks 280th of 2,176; the median Yorkshire Water overflow recorded 16 spills. On the Aire from Gill Beck (Baildon) to Wyke Beck waterbody it ranks 15th of 85.

Group	Rank by spills	Median spills	Median hours
This outlet	–	52	83.8
England	1,512th of 14,239	11	22.3
Yorkshire Water	280th of 2,176	16	37.8
Aire from Gill Beck (Baildon) to Wyke Beck	15th of 85	16	9.3

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 2020 to 2025, the reported count went from 79 to 52 spills. The highest count was 79 in 2020 and the lowest was 0 in 2021. The monitor worked for less than 90% of 2021, 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	52	83.8 hours	94.7%	Official data
2024	56	95.2 hours	70.4%Low coverage	Official data
2023	60	120.5 hours	74.4%Low coverage	Official data
2022	67	191.6 hours	98.5%	Official data
2021	0	0 hours	0.3%Low coverage	Official data
2020	79	140.7 hours	99.3%	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: Yorkshire Water
Outlet type: Storm overflow on the sewer network
Permit: WRA8566
Activity reference: A1
Grid reference: SE2098337084
Waterbody ID: GB104027063035Official 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 “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 0.5 km north-east of the Calverley reference point in the ONS built-up areas data.

Area and water pages

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

Town Gate Calver/CSO
Yorkshire Water · Culv Tributary Leeds/LPOOL Canal
Current status unknown

Lodge Farm/No 2 CSO
Yorkshire Water · Tributary of Leeds/LIVERPOOL Canal
Current status unknown
Rawdon/CSO
Yorkshire Water · River Aire
Current status unknown
Rawdon/CSO
Yorkshire Water · River Aire
Current status unknown

Questions about Calverley East/No 2 CSO

Who operates Calverley East/No 2 CSO?: Yorkshire Water is the operator named in the annual record. The permit reference is WRA8566.
Where does Calverley East/No 2 CSO discharge?: The source names Leeds & Liverpool Canal as the receiving water. This does not show how far a discharge travelled.
How many times did Calverley East/No 2 CSO spill in 2025?: The 2025 return records 52 counted spill events and 83.8 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 94.7% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
Is Calverley East/No 2 CSO 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 Calverley East/No 2 CSO?: 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 Calverley East/No 2 CSO compare with other overflows?: Calverley East/No 2 CSO recorded 52 spills in 2025. That is more than 88% of the 14,239 overflows in England with a reported figure, and ranks 1,512th nationally. Among Yorkshire Water overflows it ranks 280th of 2,176; the median Yorkshire Water overflow recorded 16 spills. On the Aire from Gill Beck (Baildon) to Wyke Beck waterbody it ranks 15th of 85. 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.