St Andrews Road Portsmouth CSO - 108474
Storm overflow operated by Southern Water. The source names Broom Channel as the receiving water.
- 3
- Spills in 2025
- 1.7
- Recorded hours
- 99.9%
- Monitor operation
- 2
- Years listed
The reported spill count was 2 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
St Andrews Road Portsmouth CSO - 108474 recorded 3 spills in 2025. That is more than 26% of the 14,239 overflows in England with a reported figure, and ranks 9,843rd nationally. Among Southern Water overflows it ranks 610th of 975; the median Southern Water overflow recorded 7 spills. On the Langstone Harbour waterbody it ranks 4th of 7.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 3 | 1.7 |
| England | 9,843rd of 14,239 | 11 | 22.3 |
| Southern Water | 610th of 975 | 7 | 17 |
| Langstone Harbour | 4th of 7 | 3 | 7.5 |
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 | 3 | 1.7 hours | 99.9% | Official data |
| 2024 | 5 | 1.4 hours | 99.8% | 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
- A01277
- Activity reference
- Storm
- Grid reference
- SU6874005590
- Waterbody ID
- GB580705130000Official 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 km south-west of the Havant 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
- Kirtley Close Drayton CSO - 108774Current status unknown
Southern Water · Langstone Harbour
- Mainland Drayton SSO - 115960Current status unknown
Southern Water · Ports Creek
- Westbrook Grove Purbrook CEO - 108498Current status unknown
Southern Water · Wallington River via Drain
- Lone Valley Waterlooville CSO - 108452Current status unknown
Southern Water · Tributary of River Wallington
Questions about St Andrews Road Portsmouth CSO - 108474
- Who operates St Andrews Road Portsmouth CSO - 108474?
- Southern Water is the operator named in the annual record. The permit reference is A01277.
- Where does St Andrews Road Portsmouth CSO - 108474 discharge?
- The source names Broom Channel as the receiving water. This does not show how far a discharge travelled.
- How many times did St Andrews Road Portsmouth CSO - 108474 spill in 2025?
- The 2025 return records 3 counted spill events and 1.7 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 99.9% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is St Andrews Road Portsmouth CSO - 108474 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 St Andrews Road Portsmouth CSO - 108474?
- 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 St Andrews Road Portsmouth CSO - 108474 compare with other overflows?
- St Andrews Road Portsmouth CSO - 108474 recorded 3 spills in 2025. That is more than 26% of the 14,239 overflows in England with a reported figure, and ranks 9,843rd nationally. Among Southern Water overflows it ranks 610th of 975; the median Southern Water overflow recorded 7 spills. On the Langstone Harbour waterbody it ranks 4th 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.