Market Overton STW (CSO)
Storm overflow operated by Severn Trent Water. The source names Tributary of Whissendine Brook as the receiving water.
- 2
- Spills in 2025
- 13.1
- Recorded hours
- 87.9%
- Monitor operation
- 6
- Years listed
Checking the latest monitor report…
How it compares in 2025
Market Overton STW (CSO) 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 Severn Trent Water overflows it ranks 1,711th of 2,431; the median Severn Trent Water overflow recorded 8 spills. On the Langham Brook from Source to Whissendine Brook waterbody it ranks 4th of 4.
The monitor worked for 87.9% of 2025, so this count may be low and its rank may understate activity.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 2 | 13.1 |
| England | 10,428th of 14,239 | 11 | 22.3 |
| Severn Trent Water | 1,711th of 2,431 | 8 | 16.2 |
| Langham Brook from Source to Whissendine Brook | 4th of 4 | 6.5 | 49.4 |
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 | 13.1 hours | 87.9%Low coverage | Official data |
| 2024 | 16 | 11.1 hours | 98.4% | Official data |
| 2023 | 10 | 15.9 hours | 94.6% | Official data |
| 2022 | 34 | 124.7 hours | 96.1% | Official data |
| 2021 | 31 | 259.9 hours | 97.2% | Official data |
| 2020 | 9 | 15.1 hours | 99.6% | 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
- Severn Trent Water
- Outlet type
- Storm tank at a wastewater treatment works
- Permit
- T/54/45475/R
- Activity reference
- A2
- Grid reference
- SK8876015756
- Waterbody ID
- GB104028047520Official 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 tank at WwTW”: storm tank at a wastewater treatment works. The overflow comes from storm storage at a treatment works.
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 of the Market Overton 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
- Ashwell PS (CSO)Current status unknown
Severn Trent Water · Tributary of Whissendine Brook
- Cottesmore STWCurrent status unknown
Anglian Water · North Brook River Gwash NT
- Wymondham (STW)Current status unknown
Severn Trent Water · Tributary of River Wreake
- Langham (STW)Current status unknown
Severn Trent Water · Langham Brook
Questions about Market Overton STW (CSO)
- Who operates Market Overton STW (CSO)?
- Severn Trent Water is the operator named in the annual record. The permit reference is T/54/45475/R.
- Where does Market Overton STW (CSO) discharge?
- The source names Tributary of Whissendine Brook as the receiving water. This does not show how far a discharge travelled.
- How many times did Market Overton STW (CSO) spill in 2025?
- The 2025 return records 2 counted spill events and 13.1 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 87.9% of the reporting period. Below 90%, some events can be missed, so the count and hours may understate activity.
- Is Market Overton STW (CSO) 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 Market Overton STW (CSO)?
- The annual return lists the asset type as “Storm tank at WwTW”, which means storm tank at a wastewater treatment works. The overflow comes from storm storage at a treatment works.
- How does Market Overton STW (CSO) compare with other overflows?
- Market Overton STW (CSO) 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 Severn Trent Water overflows it ranks 1,711th of 2,431; the median Severn Trent Water overflow recorded 8 spills. On the Langham Brook from Source to Whissendine Brook waterbody it ranks 4th 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.