Sirdar Road Southampton CSO - 108794
Storm overflow operated by Southern Water. The source names River Itchen as the receiving water.
- 17
- Spills in 2025
- 6.5
- Recorded hours
- 100%
- Monitor operation
- 5
- Years listed
The reported spill count was 16 lower than in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
Sirdar Road Southampton CSO - 108794 recorded 17 spills in 2025. That is more than 59% of the 14,239 overflows in England with a reported figure, and ranks 5,597th nationally. Among Southern Water overflows it ranks 314th of 975; the median Southern Water overflow recorded 7 spills. On the Southampton Water waterbody it ranks 8th of 39.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 17 | 6.5 |
| England | 5,597th of 14,239 | 11 | 22.3 |
| Southern Water | 314th of 975 | 7 | 17 |
| Southampton Water | 8th 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 | 17 | 6.5 hours | 100% | Official data |
| 2024 | 33 | 81.1 hours | 100% | Official data |
| 2023 | 36 | 95.7 hours | 99.9% | Official data |
| 2022 | 19 | 16.4 hours | 99.9% | Official data |
| 2021 | 22 | 31.5 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 overflow on the sewer network
- Permit
- A01294
- Activity reference
- Storm
- Grid reference
- SU4359014960
- 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 1.3 km north of the Southampton 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
- Portswood SSO - 115428Current status unknown
Southern Water · River Itchen Estuary
- Upper Shaftsbury Avenue Southampton CSO - 108792Current status unknown
Southern Water · River Itchen
- Wessex Lane Southampton Outside 11 CSO - 108496Current status unknown
Southern Water · Saline Estuary
- Wessex Lane Southampton Outside 15 CSO - 108495Current status unknown
Southern Water · Saline Estuary
Questions about Sirdar Road Southampton CSO - 108794
- Who operates Sirdar Road Southampton CSO - 108794?
- Southern Water is the operator named in the annual record. The permit reference is A01294.
- Where does Sirdar Road Southampton CSO - 108794 discharge?
- The source names River Itchen as the receiving water. This does not show how far a discharge travelled.
- How many times did Sirdar Road Southampton CSO - 108794 spill in 2025?
- The 2025 return records 17 counted spill events and 6.5 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 Sirdar Road Southampton CSO - 108794 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 Sirdar Road Southampton CSO - 108794?
- 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 Sirdar Road Southampton CSO - 108794 compare with other overflows?
- Sirdar Road Southampton CSO - 108794 recorded 17 spills in 2025. That is more than 59% of the 14,239 overflows in England with a reported figure, and ranks 5,597th nationally. Among Southern Water overflows it ranks 314th of 975; the median Southern Water overflow recorded 7 spills. On the Southampton Water waterbody it ranks 8th of 39. 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.