Compton Castle CSO Compton
Storm overflow operated by South West Water. The source names Tributary of Aller Brook as the receiving water.
- 69
- Spills in 2025
- 658.7
- Recorded hours
- 79%
- Monitor operation
- 5
- Years listed
Checking the latest monitor report…
How it compares in 2025
Compton Castle CSO Compton recorded 69 spills in 2025. That is more than 94% of the 14,239 overflows in England with a reported figure, and ranks 792nd nationally. Among South West Water overflows it ranks 221st of 1,357; the median South West Water overflow recorded 21 spills. On the Aller Brook waterbody it ranks 2nd of 4.
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 | – | 69 | 658.7 |
| England | 792nd of 14,239 | 11 | 22.3 |
| South West Water | 221st of 1,357 | 21 | 39.4 |
| Aller Brook | 2nd of 4 | 66 | 264.9 |
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 | 69 | 658.7 hours | 79%Low coverage | Official data |
| 2024 | 144 | 2,069.3 hours | 97.2% | Official data |
| 2023 | 142 | 2,179.7 hours | 91.8% | Official data |
| 2022 | 110 | 1,271.5 hours | 51%Low coverage | Official data |
| 2021 | 112 | 1,033.6 hours | 98% | 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
- South West Water
- Outlet type
- Storm overflow on the sewer network
- Permit
- 201791
- Activity reference
- A1
- Grid reference
- SX86496533
- Waterbody ID
- GB108046005340Official waterbody record ↗
- Location source
- Official annual grid reference
- Location precision
- About 10 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 2.3 km north of the Marldon 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
- Compton & Marldon STW So ComptonCurrent status unknown
South West Water · Tributary of the Aller Brook
- Furzegood SPS Pscsoeo MarldonCurrent status unknown
South West Water · Tributary of Gatcombe Brook
- Main St/Town Orchard CSO AbbotskerswellCurrent status unknown
South West Water · Tributary of Aller Brook
- Ipplepen STW So IpplepenCurrent status unknown
South West Water · Halwell Stream
Questions about Compton Castle CSO Compton
- Who operates Compton Castle CSO Compton?
- South West Water is the operator named in the annual record. The permit reference is 201791.
- Where does Compton Castle CSO Compton discharge?
- The source names Tributary of Aller Brook as the receiving water. This does not show how far a discharge travelled.
- How many times did Compton Castle CSO Compton spill in 2025?
- The 2025 return records 69 counted spill events and 658.7 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 79% of the reporting period. Below 90%, some events can be missed, so the count and hours may understate activity.
- Is Compton Castle CSO Compton 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 10 metres. It shows the recorded outlet position, not the extent of any discharge.
- What kind of outlet is Compton Castle CSO Compton?
- 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 Compton Castle CSO Compton compare with other overflows?
- Compton Castle CSO Compton recorded 69 spills in 2025. That is more than 94% of the 14,239 overflows in England with a reported figure, and ranks 792nd nationally. Among South West Water overflows it ranks 221st of 1,357; the median South West Water overflow recorded 21 spills. On the Aller Brook waterbody it ranks 2nd of 4. 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.