Scalby Mills/CSO
Storm overflow operated by Yorkshire Water. The source names North Sea as the receiving water.
- 49
- Spills in 2025
- 103.4
- Recorded hours
- 100%
- Monitor operation
- 5
- Years listed
The reported spill count was 5 lower than in 2024. This compares event counts, not discharge volume.
We do not have a live report for this outlet. Its annual spill records are shown below.
How it compares in 2025
Scalby Mills/CSO recorded 49 spills in 2025. That is more than 87% of the 14,239 overflows in England with a reported figure, and ranks 1,699th nationally. Among Yorkshire Water overflows it ranks 313th of 2,176; the median Yorkshire Water overflow recorded 16 spills. On the Yorkshire North waterbody it ranks 1st of 20.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 49 | 103.4 |
| England | 1,699th of 14,239 | 11 | 22.3 |
| Yorkshire Water | 313th of 2,176 | 16 | 37.8 |
| Yorkshire North | 1st of 20 | 10 | 67.6 |
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 | 49 | 103.4 hours | 100% | Official data |
| 2024 | 54 | 94.8 hours | 99.9% | Official data |
| 2023 | 59 | 122.9 hours | 99.9% | Official data |
| 2022 | 47 | 65.8 hours | 100% | Official data |
| 2021 | Unknown | Unknown | Unknown | 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
- 27/27/0055
- Activity reference
- 1
- Grid reference
- TA0470091640
- Waterbody ID
- GB650401500004Official 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 3.7 km east of the Scalby 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
- Scarborough/STW/Storm TreatmentCurrent status unknown
Yorkshire Water · Permit applied for
- Toll House/SPSCurrent status unknown
Yorkshire Water · North Sea
- Aquarium Top/CSOCurrent status unknown
Yorkshire Water · North Sea
- Holbeck Hill/CSOCurrent status unknown
Yorkshire Water · Holbeck Ravine (Culverted)
Questions about Scalby Mills/CSO
- Who operates Scalby Mills/CSO?
- Yorkshire Water is the operator named in the annual record. The permit reference is 27/27/0055.
- Where does Scalby Mills/CSO discharge?
- The source names North Sea as the receiving water. This does not show how far a discharge travelled.
- How many times did Scalby Mills/CSO spill in 2025?
- The 2025 return records 49 counted spill events and 103.4 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 Scalby Mills/CSO discharging right now?
- This record is not matched to a company live feed, so we cannot show a current report. Only the annual figures are available for this outlet.
- 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 Scalby Mills/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 Scalby Mills/CSO compare with other overflows?
- Scalby Mills/CSO recorded 49 spills in 2025. That is more than 87% of the 14,239 overflows in England with a reported figure, and ranks 1,699th nationally. Among Yorkshire Water overflows it ranks 313th of 2,176; the median Yorkshire Water overflow recorded 16 spills. On the Yorkshire North waterbody it ranks 1st of 20. 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.