Green Lane Chilworth CEO - 108785
Storm overflow operated by Southern Water. The source names Unnamed Tributary of River Itchen as the receiving water.
- 6
- Spills in 2025
- 29.3
- Recorded hours
- 99.7%
- Monitor operation
- 5
- Years listed
Checking the latest monitor report…
How it compares in 2025
Green Lane Chilworth CEO - 108785 recorded 6 spills in 2025. That is more than 37% of the 14,239 overflows in England with a reported figure, and ranks 8,498th nationally. Among Southern Water overflows it ranks 509th of 975; the median Southern Water overflow recorded 7 spills. On the Monks Brook waterbody it ranks 1st of 8.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 6 | 29.3 |
| England | 8,498th of 14,239 | 11 | 22.3 |
| Southern Water | 509th of 975 | 7 | 17 |
| Monks Brook | 1st of 8 | 2.5 | 1.3 |
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 | 6 | 29.3 hours | 99.7% | Official data |
| 2024 | 2 | 20.4 hours | 86.7%Low coverage | Official data |
| 2023 | 5 | 10.7 hours | 99.8% | Official data |
| 2022 | 4 | 1.5 hours | 99.9% | Official data |
| 2021 | 5 | 3 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
- A01290
- Activity reference
- Storm
- Grid reference
- SU4204018020
- Waterbody ID
- GB107042016310Official 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 source name includes CEO, which Southern Water defines as Combined Emergency Overflow. The name and the listed type are separate source fields, so the name does not describe the layout of the site. Southern Water flow and spill reporting glossary ↗
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 0.5 km north-east of the Chilworth (Test Valley) 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.
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Questions about Green Lane Chilworth CEO - 108785
- Who operates Green Lane Chilworth CEO - 108785?
- Southern Water is the operator named in the annual record. The permit reference is A01290.
- Where does Green Lane Chilworth CEO - 108785 discharge?
- The source names Unnamed Tributary of River Itchen as the receiving water. This does not show how far a discharge travelled.
- How many times did Green Lane Chilworth CEO - 108785 spill in 2025?
- The 2025 return records 6 counted spill events and 29.3 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 99.7% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Green Lane Chilworth CEO - 108785 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 Green Lane Chilworth CEO - 108785?
- 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. The source name includes CEO, which Southern Water defines as Combined Emergency Overflow. The name and the listed type are separate source fields.
- How does Green Lane Chilworth CEO - 108785 compare with other overflows?
- Green Lane Chilworth CEO - 108785 recorded 6 spills in 2025. That is more than 37% of the 14,239 overflows in England with a reported figure, and ranks 8,498th nationally. Among Southern Water overflows it ranks 509th of 975; the median Southern Water overflow recorded 7 spills. On the Monks Brook waterbody it ranks 1st of 8. 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.