Warminster Calveswater
Storm overflow operated by Wessex Water. The source names The Were via SWS as the receiving water.
- 22
- Spills in 2025
- 50.7
- Recorded hours
- 100%
- Monitor operation
- 4
- Years listed
The reported spill count was 32 lower than in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
Warminster Calveswater recorded 22 spills in 2025. That is more than 65% of the 14,239 overflows in England with a reported figure, and ranks 4,697th nationally. Among Wessex Water overflows it ranks 415th of 1,332; the median Wessex Water overflow recorded 11 spills. On the Wylye Trib (The Were or Swan) waterbody it ranks 2nd of 4.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 22 | 50.7 |
| England | 4,697th of 14,239 | 11 | 22.3 |
| Wessex Water | 415th of 1,332 | 11 | 18.9 |
| Wylye Trib (The Were or Swan) | 2nd of 4 | 18 | 27.6 |
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 | 22 | 50.7 hours | 100% | Official data |
| 2024 | 54 | 224.5 hours | 100% | Official data |
| 2023 | 45 | 141.6 hours | 100% | Official data |
| 2022 | 26 | 76 hours | 99.8% | 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
- Wessex Water
- Outlet type
- Storm discharge at a pumping station
- Permit
- 401094
- Activity reference
- 1-STORM/EMERGENCY
- Grid reference
- ST8814044220
- Waterbody ID
- GB108043022540Official 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 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 south of the Warminster 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
- Warminster Storm TankCurrent status unknown
Wessex Water · River Wylye
- Hindon The DeneCurrent status unknown
Wessex Water · Tributary of the River Nadder
- Hindon InletCurrent status unknown
Wessex Water · Groundwater via Infilt System
- ChilmarkCurrent status unknown
Wessex Water · Tributary of the River Nadder
Questions about Warminster Calveswater
- Who operates Warminster Calveswater?
- Wessex Water is the operator named in the annual record. The permit reference is 401094.
- Where does Warminster Calveswater discharge?
- The source names The Were via SWS as the receiving water. This does not show how far a discharge travelled.
- How many times did Warminster Calveswater spill in 2025?
- The 2025 return records 22 counted spill events and 50.7 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 100% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Warminster Calveswater 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 Warminster Calveswater?
- 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.
- How does Warminster Calveswater compare with other overflows?
- Warminster Calveswater recorded 22 spills in 2025. That is more than 65% of the 14,239 overflows in England with a reported figure, and ranks 4,697th nationally. Among Wessex Water overflows it ranks 415th of 1,332; the median Wessex Water overflow recorded 11 spills. On the Wylye Trib (The Were or Swan) 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.