Melksham Semington Roundabout
Storm overflow operated by Wessex Water. The source names (S) River Avon as the receiving water.
- 2
- Spills in 2025
- 12.5
- Recorded hours
- 100%
- Monitor operation
- 4
- Years listed
Checking the latest monitor report…
How it compares in 2025
Melksham Semington Roundabout recorded 2 spills in 2025. That is more than 21% of the 14,239 overflows in England with a reported figure, and ranks 10,428th nationally. Among Wessex Water overflows it ranks 977th of 1,332; the median Wessex Water overflow recorded 11 spills. On the Avon (Brist) conf R Marden to conf Semington Bk waterbody it ranks 17th of 25.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 2 | 12.5 |
| England | 10,428th of 14,239 | 11 | 22.3 |
| Wessex Water | 977th of 1,332 | 11 | 18.9 |
| Avon (Brist) conf R Marden to conf Semington Bk | 17th of 25 | 6 | 40.4 |
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 | 2 | 12.5 hours | 100% | Official data |
| 2024 | 11 | 81.6 hours | 89.1%Low coverage | Official data |
| 2023 | 0 | 0 hours | 100% | Official data |
| 2022 | 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
- Wessex Water
- Outlet type
- Storm discharge at a pumping station
- Permit
- 100632
- Activity reference
- 1-STORM/EMERGENCY
- Grid reference
- ST8964063540
- Waterbody ID
- GB109053027440Official 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 1.5 km south-west of the Melksham 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
- Melksham Semington Road O/S Police StationCurrent status unknown
Wessex Water · River Avon(S)
- Melksham Storm TankCurrent status unknown
Wessex Water · River Avon
- Melksham InletCurrent status unknown
Wessex Water · River Avon
- Melksham Bath Road Off Road F/O Scout HallCurrent status unknown
Wessex Water · Clackers Brook
Questions about Melksham Semington Roundabout
- Who operates Melksham Semington Roundabout?
- Wessex Water is the operator named in the annual record. The permit reference is 100632.
- Where does Melksham Semington Roundabout discharge?
- The source names (S) River Avon as the receiving water. This does not show how far a discharge travelled.
- How many times did Melksham Semington Roundabout spill in 2025?
- The 2025 return records 2 counted spill events and 12.5 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 Melksham Semington Roundabout 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 Melksham Semington Roundabout?
- 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 Melksham Semington Roundabout compare with other overflows?
- Melksham Semington Roundabout recorded 2 spills in 2025. That is more than 21% of the 14,239 overflows in England with a reported figure, and ranks 10,428th nationally. Among Wessex Water overflows it ranks 977th of 1,332; the median Wessex Water overflow recorded 11 spills. On the Avon (Brist) conf R Marden to conf Semington Bk waterbody it ranks 17th of 25. 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.