Lealholm School/CSO

Storm overflow operated by Yorkshire Water. The source names River Esk as the receiving water.

10
Spills in 2025: 37.8
Recorded hours: 99.8%
Monitor operation: 6
Years listed

Current status unknown

Checking the latest monitor report…

How it compares in 2025

Lealholm School/CSO recorded 10 spills in 2025. That is more than 47% of the 14,239 overflows in England with a reported figure, and ranks 7,195th nationally. Among Yorkshire Water overflows it ranks 1,279th of 2,176; the median Yorkshire Water overflow recorded 16 spills. On the Esk from Sleddale Beck to Ruswarp waterbody it ranks 11th of 15.

Group	Rank by spills	Median spills	Median hours
This outlet	–	10	37.8
England	7,195th of 14,239	11	22.3
Yorkshire Water	1,279th of 2,176	16	37.8
Esk from Sleddale Beck to Ruswarp	11th of 15	22	73.5

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 8 to 10 spills. The highest count was 24 in 2021 and the lowest was 8 in 2020. The monitor worked for less than 90% of 2024, so that count 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	10	37.8 hours	99.8%	Official data
2024	17	147.3 hours	89%Low coverage	Official data
2023	15	111.5 hours	95.8%	Official data
2022	24	212.8 hours	99.6%	Official data
2021	24	189.5 hours	98.8%	Official data
2020	8	50.9 hours	100%	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 discharge at a pumping station
Permit: 27/29/0061
Activity reference: 2
Grid reference: NZ7625007640
Waterbody ID: GB104027068150Official 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 “Storm discharge at pumping station”: storm discharge at a pumping station. The overflow is at a pumping station that moves sewage through the 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 7.6 km east of the Castleton (Scarborough) reference point in the ONS built-up areas data.

Area and water pages

Esk from Sleddale Beck to Ruswarp 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

Lealholm/STW
Yorkshire Water · River Esk
Current status unknown

Lower Under Hill/CSO
Yorkshire Water · Unnamed Tributary of River Esk
Current status unknown
Danby/STW
Yorkshire Water · River Esk
Current status unknown
Castleton/SPS
Yorkshire Water · Danby Beck
Current status unknown

Questions about Lealholm School/CSO

Who operates Lealholm School/CSO?: Yorkshire Water is the operator named in the annual record. The permit reference is 27/29/0061.
Where does Lealholm School/CSO discharge?: The source names River Esk as the receiving water. This does not show how far a discharge travelled.
How many times did Lealholm School/CSO spill in 2025?: The 2025 return records 10 counted spill events and 37.8 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 99.8% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
Is Lealholm School/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 Lealholm School/CSO?: The annual return lists the asset type as “Storm discharge at pumping station”, which means storm discharge at a pumping station. The overflow is at a pumping station that moves sewage through the network.
How does Lealholm School/CSO compare with other overflows?: Lealholm School/CSO recorded 10 spills in 2025. That is more than 47% of the 14,239 overflows in England with a reported figure, and ranks 7,195th nationally. Among Yorkshire Water overflows it ranks 1,279th of 2,176; the median Yorkshire Water overflow recorded 16 spills. On the Esk from Sleddale Beck to Ruswarp waterbody it ranks 11th of 15. 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.