Malmesbury Lower High Street
Storm overflow operated by Wessex Water. The source names Sherston Avon as the receiving water.
- 18
- Spills in 2025
- 70.3
- Recorded hours
- 97.5%
- Monitor operation
- 4
- Years listed
The reported spill count was 25 lower than in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
Malmesbury Lower High Street recorded 18 spills in 2025. That is more than 60% of the 14,239 overflows in England with a reported figure, and ranks 5,407th nationally. Among Wessex Water overflows it ranks 497th of 1,332; the median Wessex Water overflow recorded 11 spills. On the Sherston Avon waterbody it ranks 4th of 8.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 18 | 70.3 |
| England | 5,407th of 14,239 | 11 | 22.3 |
| Wessex Water | 497th of 1,332 | 11 | 18.9 |
| Sherston Avon | 4th of 8 | 16 | 8.6 |
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 | 18 | 70.3 hours | 97.5% | Official data |
| 2024 | 43 | 175 hours | 99.4% | Official data |
| 2023 | 40 | 149.8 hours | 93.9% | Official data |
| 2022 | 20 | 10.3 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
- Wessex Water
- Outlet type
- Storm overflow on the sewer network
- Permit
- 012851
- Activity reference
- 1-STORM OVERFLOW
- Grid reference
- ST9352386908
- Waterbody ID
- GB109053027690Official 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 “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 0.7 km south-east of the Malmesbury 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
- Malmesbury Parliament RowCurrent status unknown
Wessex Water · River Avon (Sherston Branch)
- Malmesbury St Johns StreetCurrent status unknown
Wessex Water · River Avon (Tetbury Branch)
- Malmesbury Burton HillCurrent status unknown
Wessex Water · Tributary of River Avon(S)
- Malmesbury Harpers LaneCurrent status unknown
Wessex Water · River Avon (Sherston Branch)
Questions about Malmesbury Lower High Street
- Who operates Malmesbury Lower High Street?
- Wessex Water is the operator named in the annual record. The permit reference is 012851.
- Where does Malmesbury Lower High Street discharge?
- The source names Sherston Avon as the receiving water. This does not show how far a discharge travelled.
- How many times did Malmesbury Lower High Street spill in 2025?
- The 2025 return records 18 counted spill events and 70.3 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 97.5% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Malmesbury Lower High Street 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 Malmesbury Lower High Street?
- 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 Malmesbury Lower High Street compare with other overflows?
- Malmesbury Lower High Street recorded 18 spills in 2025. That is more than 60% of the 14,239 overflows in England with a reported figure, and ranks 5,407th nationally. Among Wessex Water overflows it ranks 497th of 1,332; the median Wessex Water overflow recorded 11 spills. On the Sherston Avon waterbody it ranks 4th 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.