St Marys Road Cowes CSO - 108562
Storm overflow operated by Southern Water. The source names The Solent as the receiving water.
- 51
- Spills in 2025
- 97.6
- Recorded hours
- 100%
- Monitor operation
- 5
- Years listed
The reported spill count was 63 lower than in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
St Marys Road Cowes CSO - 108562 recorded 51 spills in 2025. That is more than 88% of the 14,239 overflows in England with a reported figure, and ranks 1,571st nationally. Among Southern Water overflows it ranks 67th of 975; the median Southern Water overflow recorded 7 spills. On the Solent waterbody it ranks 7th of 43.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 51 | 97.6 |
| England | 1,571st of 14,239 | 11 | 22.3 |
| Southern Water | 67th of 975 | 7 | 17 |
| Solent | 7th of 43 | 9 | 22.9 |
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 | 51 | 97.6 hours | 100% | Official data |
| 2024 | 114 | 1,042.1 hours | 98.9% | Official data |
| 2023 | 90 | 674.8 hours | 100% | Official data |
| 2022 | 48 | 184.1 hours | 100% | Official data |
| 2021 | 61 | 166.7 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
- Southern Water
- Outlet type
- Storm discharge at a pumping station
- Permit
- A01356
- Activity reference
- Storm
- Grid reference
- SZ4976096140
- Waterbody ID
- GB650705150000Official 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 1.6 km north-west of the East Cowes 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
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Questions about St Marys Road Cowes CSO - 108562
- Who operates St Marys Road Cowes CSO - 108562?
- Southern Water is the operator named in the annual record. The permit reference is A01356.
- Where does St Marys Road Cowes CSO - 108562 discharge?
- The source names The Solent as the receiving water. This does not show how far a discharge travelled.
- How many times did St Marys Road Cowes CSO - 108562 spill in 2025?
- The 2025 return records 51 counted spill events and 97.6 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 St Marys Road Cowes CSO - 108562 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 St Marys Road Cowes CSO - 108562?
- 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 St Marys Road Cowes CSO - 108562 compare with other overflows?
- St Marys Road Cowes CSO - 108562 recorded 51 spills in 2025. That is more than 88% of the 14,239 overflows in England with a reported figure, and ranks 1,571st nationally. Among Southern Water overflows it ranks 67th of 975; the median Southern Water overflow recorded 7 spills. On the Solent waterbody it ranks 7th of 43. 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.