Muston/CSO
Storm overflow operated by Yorkshire Water. The source names Unnamed Tributary of Hertford as the receiving water.
- 25
- Spills in 2025
- 188
- Recorded hours
- 83%
- Monitor operation
- 4
- Years listed
Checking the latest monitor report…
How it compares in 2025
Muston/CSO recorded 25 spills in 2025. That is more than 69% of the 14,239 overflows in England with a reported figure, and ranks 4,212th nationally. Among Yorkshire Water overflows it ranks 815th of 2,176; the median Yorkshire Water overflow recorded 16 spills. On the Hertford from Source to River Derwent waterbody it ranks 2nd of 7.
The monitor worked for 83% of 2025, so this count may be low and its rank may understate activity.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 25 | 188 |
| England | 4,212th of 14,239 | 11 | 22.3 |
| Yorkshire Water | 815th of 2,176 | 16 | 37.8 |
| Hertford from Source to River Derwent | 2nd of 7 | 22 | 40.3 |
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
| Year | Spills | Duration | Monitor operation | Source |
|---|---|---|---|---|
| 2025 | 25 | 188 hours | 83%Low coverage | Official data |
| 2024 | 27 | 190.8 hours | 96.7% | Official data |
| 2023 | 9 | 61.3 hours | 6.7%Low coverage | Official data |
| 2022 | 10 | 28.8 hours | 99.9% | 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
- 27/27/0102
- Activity reference
- A1
- Grid reference
- TA0956079840
- Waterbody ID
- GB104027067811Official 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 0.3 km north of the Muston (Scarborough) reference point in the ONS built-up areas data.
Designated bathing waters within 3 km in a straight line:
Distance does not show that water from this outlet reaches a bathing water. Check the official bathing-water profile for its classification and advice.
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
- Gristhorpe Tank/CSOCurrent status unknown
Yorkshire Water · Tributary of River Hertford
- Filey Transfer/CSOCurrent status unknown
Yorkshire Water · North Sea
- Filey Transfer/CSOCurrent status unknown
Yorkshire Water · North Sea
- Lebberston/CSOCurrent status unknown
Yorkshire Water · Unnamed Tributary of Hertford
Questions about Muston/CSO
- Who operates Muston/CSO?
- Yorkshire Water is the operator named in the annual record. The permit reference is 27/27/0102.
- Where does Muston/CSO discharge?
- The source names Unnamed Tributary of Hertford as the receiving water. This does not show how far a discharge travelled.
- How many times did Muston/CSO spill in 2025?
- The 2025 return records 25 counted spill events and 188 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 83% of the reporting period. Below 90%, some events can be missed, so the count and hours may understate activity.
- Is Muston/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 Muston/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 Muston/CSO compare with other overflows?
- Muston/CSO recorded 25 spills in 2025. That is more than 69% of the 14,239 overflows in England with a reported figure, and ranks 4,212th nationally. Among Yorkshire Water overflows it ranks 815th of 2,176; the median Yorkshire Water overflow recorded 16 spills. On the Hertford from Source to River Derwent waterbody it ranks 2nd of 7. 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.