Westcroft CSO Holsworthy
Storm overflow operated by South West Water. The source names River Deer as the receiving water.
- 72
- Spills in 2025
- 256.5
- Recorded hours
- 100%
- Monitor operation
- 5
- Years listed
The reported spill count was 10 lower than in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
Westcroft CSO Holsworthy recorded 72 spills in 2025. That is more than 94% of the 14,239 overflows in England with a reported figure, and ranks 710th nationally. Among South West Water overflows it ranks 202nd of 1,357; the median South West Water overflow recorded 21 spills. On the Deer waterbody it ranks 3rd of 4.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 72 | 256.5 |
| England | 710th of 14,239 | 11 | 22.3 |
| South West Water | 202nd of 1,357 | 21 | 39.4 |
| Deer | 3rd of 4 | 74.5 | 333.2 |
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 | 72 | 256.5 hours | 100% | Official data |
| 2024 | 82 | 395.8 hours | 100% | Official data |
| 2023 | 78 | 322 hours | 93% | Official data |
| 2022 | 4 | 6.3 hours | 46%Low coverage | Official data |
| 2021 | Unknown | Unknown | Unknown | 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
- SWWA 2228
- Activity reference
- A1
- Grid reference
- SS33880367
- Waterbody ID
- GB108047013880Official 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 0.5 km south-west of the Holsworthy 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
- Derriton STW So HolsworthyCurrent status unknown
South West Water · Coles Stream (S)
- Derriton STW SSO HolsworthyCurrent status unknown
South West Water · Coles Stream (S)
- Dobles Lane SPS Pscsoeo HolsworthyCurrent status unknown
South West Water · Tributary River Deer (S)
- Dobles Lane Ind Est CSO HolsworthyCurrent status unknown
South West Water · Trib of River Deer
Questions about Westcroft CSO Holsworthy
- Who operates Westcroft CSO Holsworthy?
- South West Water is the operator named in the annual record. The permit reference is SWWA 2228.
- Where does Westcroft CSO Holsworthy discharge?
- The source names River Deer as the receiving water. This does not show how far a discharge travelled.
- How many times did Westcroft CSO Holsworthy spill in 2025?
- The 2025 return records 72 counted spill events and 256.5 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 Westcroft CSO Holsworthy 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 Westcroft CSO Holsworthy?
- 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 Westcroft CSO Holsworthy compare with other overflows?
- Westcroft CSO Holsworthy recorded 72 spills in 2025. That is more than 94% of the 14,239 overflows in England with a reported figure, and ranks 710th nationally. Among South West Water overflows it ranks 202nd of 1,357; the median South West Water overflow recorded 21 spills. On the Deer waterbody it ranks 3rd 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.