High Street Southampton CSO - 108440
Storm overflow operated by Southern Water. The source names River Test Estuary as the receiving water.
- 0
- Spills in 2025
- 0
- Recorded hours
- 100%
- Monitor operation
- 5
- Years listed
The reported spill count was the same as 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
High Street Southampton CSO - 108440 recorded no spills in 2025. It is one of 2,231 overflows in England with a reported count of zero, out of 14,239 with a count.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 0 | 0 |
| England | 12,009th of 14,239 | 11 | 22.3 |
| Southern Water | 801st of 975 | 7 | 17 |
| Southampton Water | 31st of 39 | 5 | 9.5 |
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
| Year | Spills | Duration | Monitor operation | Source |
|---|---|---|---|---|
| 2025 | 0 | 0 hours | 100% | Official data |
| 2024 | 0 | 0 hours | 99.8% | Official data |
| 2023 | 0 | 0 hours | 100% | Official data |
| 2022 | 2 | 1.5 hours | 99.5% | Official data |
| 2021 | 1 | 0.7 hours | 99% | 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 overflow on the sewer network
- Permit
- A00371
- Activity reference
- Storm
- Grid reference
- SU4207010840
- Waterbody ID
- GB520704202800Official 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 2.9 km east of the Marchwood 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
- Blechynden Terrace Southampton CSO - 108396Current status unknown
Southern Water · River Test
- Park Road Southampton CSO - 108467Current status unknown
Southern Water · Test Estuary
- Millbrook CSO - 116169Current status unknown
Southern Water · The River Test
- Millbrook SSO - 115420Current status unknown
Southern Water · The River Test
Questions about High Street Southampton CSO - 108440
- Who operates High Street Southampton CSO - 108440?
- Southern Water is the operator named in the annual record. The permit reference is A00371.
- Where does High Street Southampton CSO - 108440 discharge?
- The source names River Test Estuary as the receiving water. This does not show how far a discharge travelled.
- How many times did High Street Southampton CSO - 108440 spill in 2025?
- The 2025 return records 0 counted spill events and 0 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 High Street Southampton CSO - 108440 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 High Street Southampton CSO - 108440?
- 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 High Street Southampton CSO - 108440 compare with other overflows?
- High Street Southampton CSO - 108440 recorded no spills in 2025. It is one of 2,231 overflows in England with a reported count of zero, out of 14,239 with a count. 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.