Fenny Compton STW (SSTO)
Storm overflow operated by Severn Trent Water. The source names Tributary of the River Itchen as the receiving water.
- 70
- Spills in 2025
- 866.1
- Recorded hours
- 79%
- Monitor operation
- 2
- Years listed
Checking the latest monitor report…
How it compares in 2025
Fenny Compton STW (SSTO) recorded 70 spills in 2025. That is more than 94% of the 14,239 overflows in England with a reported figure, and ranks 768th nationally. Among Severn Trent Water overflows it ranks 44th of 2,431; the median Severn Trent Water overflow recorded 8 spills.
The monitor worked for 79% of 2025, so this count may be low and its rank may understate activity.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 70 | 866.1 |
| England | 768th of 14,239 | 11 | 22.3 |
| Severn Trent Water | 44th of 2,431 | 8 | 16.2 |
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 | 70 | 866.1 hours | 79%Low coverage | Official data |
| 2024 | 250 | 4,249.3 hours | 56.5%Low coverage | 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
- Severn Trent Water
- Outlet type
- Inlet storm overflow at a wastewater treatment works, with treatment
- Permit
- S/12/25307/R
- Activity reference
- A2
- Grid reference
- SP4203853138
- Waterbody ID
- GB109054044070Official 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 “Inlet SO at WwTW - with treatment”: inlet storm overflow at a wastewater treatment works, with treatment. The overflow is at the inlet of a treatment works, where wastewater enters the works. The return records this variant as discharging with treatment.
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 0.8 km north of the Fenny Compton 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
- Fenny Compton STW 6Dwf (CSO)Current status unknown
Severn Trent Water · Tributary of the River Itchen
- Farnborough STWCurrent status unknown
Thames Water · Tributary of Hanwell Brook
- Warmington STWCurrent status unknown
Thames Water · Hanwell Brook
- Boddington STWCurrent status unknown
Thames Water · Boddington Canal Feeder
Questions about Fenny Compton STW (SSTO)
- Who operates Fenny Compton STW (SSTO)?
- Severn Trent Water is the operator named in the annual record. The permit reference is S/12/25307/R.
- Where does Fenny Compton STW (SSTO) discharge?
- The source names Tributary of the River Itchen as the receiving water. This does not show how far a discharge travelled.
- How many times did Fenny Compton STW (SSTO) spill in 2025?
- The 2025 return records 70 counted spill events and 866.1 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 79% of the reporting period. Below 90%, some events can be missed, so the count and hours may understate activity.
- Is Fenny Compton STW (SSTO) 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 Fenny Compton STW (SSTO)?
- The annual return lists the asset type as “Inlet SO at WwTW - with treatment”, which means inlet storm overflow at a wastewater treatment works, with treatment. The overflow is at the inlet of a treatment works, where wastewater enters the works. The return records this variant as discharging with treatment.
- How does Fenny Compton STW (SSTO) compare with other overflows?
- Fenny Compton STW (SSTO) recorded 70 spills in 2025. That is more than 94% of the 14,239 overflows in England with a reported figure, and ranks 768th nationally. Among Severn Trent Water overflows it ranks 44th of 2,431; the median Severn Trent Water overflow recorded 8 spills. 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.