Marehay STW (6Dwf)
Storm overflow operated by Severn Trent Water. The source names Tributary of Bottle Brook as the receiving water.
- 8
- Spills in 2025
- 14.4
- Recorded hours
- 88.1%
- Monitor operation
- 6
- Years listed
We do not have a live report for this outlet. Its annual spill records are shown below.
How it compares in 2025
Marehay STW (6Dwf) recorded 8 spills in 2025. That is more than 42% of the 14,239 overflows in England with a reported figure, and ranks 7,797th nationally. Among Severn Trent Water overflows it ranks 1,204th of 2,431; the median Severn Trent Water overflow recorded 8 spills. On the Bottle Brook Catchment (trib of Derwent) waterbody it ranks 8th of 23.
The monitor worked for 88.1% of 2025, so this count may be low and its rank may understate activity.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 8 | 14.4 |
| England | 7,797th of 14,239 | 11 | 22.3 |
| Severn Trent Water | 1,204th of 2,431 | 8 | 16.2 |
| Bottle Brook Catchment (trib of Derwent) | 8th of 23 | 2 | 0.5 |
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 | 8 | 14.4 hours | 88.1%Low coverage | Official data |
| 2024 | 41 | 76.2 hours | 99.7% | Official data |
| 2023 | 39 | 86.8 hours | 99% | Official data |
| 2022 | 77 | 86.1 hours | 92.8% | Official data |
| 2021 | 51 | 37 hours | 97% | Official data |
| 2020 | 8 | 3.5 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
- Severn Trent Water
- Outlet type
- Inlet storm overflow at a wastewater treatment works
- Permit
- T/45/45471/R
- Activity reference
- A3
- Grid reference
- SK3981048200
- Waterbody ID
- GB104028052300Official 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 “Inlet SO at WwTW”: inlet storm overflow at a wastewater treatment works. The overflow is at the inlet of a treatment works, where wastewater enters the 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 1.5 km north-west of the Denby Common 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
- Marehay STW (SSTO)Current status unknown
Severn Trent Water · Tributary of Bottle Brook
- Marehay Tps (CSO)Current status unknown
Severn Trent Water · Tributary of Bottle Brook
- Ripley - Derby Road 209 (CSO)Current status unknown
Severn Trent Water · Tributary of Bottle Brook
- Ripley - Derby Road/Bowler Street (CSO)Current status unknown
Severn Trent Water · Tributary of Bottle Brook
Questions about Marehay STW (6Dwf)
- Who operates Marehay STW (6Dwf)?
- Severn Trent Water is the operator named in the annual record. The permit reference is T/45/45471/R.
- Where does Marehay STW (6Dwf) discharge?
- The source names Tributary of Bottle Brook as the receiving water. This does not show how far a discharge travelled.
- How many times did Marehay STW (6Dwf) spill in 2025?
- The 2025 return records 8 counted spill events and 14.4 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 88.1% of the reporting period. Below 90%, some events can be missed, so the count and hours may understate activity.
- Is Marehay STW (6Dwf) discharging right now?
- This record is not matched to a company live feed, so we cannot show a current report. Only the annual figures are available for this outlet.
- 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 Marehay STW (6Dwf)?
- The annual return lists the asset type as “Inlet SO at WwTW”, which means inlet storm overflow at a wastewater treatment works. The overflow is at the inlet of a treatment works, where wastewater enters the works.
- How does Marehay STW (6Dwf) compare with other overflows?
- Marehay STW (6Dwf) recorded 8 spills in 2025. That is more than 42% of the 14,239 overflows in England with a reported figure, and ranks 7,797th nationally. Among Severn Trent Water overflows it ranks 1,204th of 2,431; the median Severn Trent Water overflow recorded 8 spills. On the Bottle Brook Catchment (trib of Derwent) waterbody it ranks 8th of 23. 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.