Marehay STW (SSTO)
Storm overflow operated by Severn Trent Water. The source names Tributary of Bottle Brook as the receiving water.
- 30
- Spills in 2025
- 428.7
- Recorded hours
- 99.2%
- Monitor operation
- 6
- Years listed
The reported spill count was 51 lower than in 2024. This compares event counts, not discharge volume.
We do not have a live report for this outlet. Its annual spill records are shown below.
How it compares in 2025
Marehay STW (SSTO) recorded 30 spills in 2025. That is more than 74% of the 14,239 overflows in England with a reported figure, and ranks 3,488th nationally. Among Severn Trent Water overflows it ranks 380th of 2,431; the median Severn Trent Water overflow recorded 8 spills. On the Bottle Brook Catchment (trib of Derwent) waterbody it ranks 4th of 23.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 30 | 428.7 |
| England | 3,488th of 14,239 | 11 | 22.3 |
| Severn Trent Water | 380th of 2,431 | 8 | 16.2 |
| Bottle Brook Catchment (trib of Derwent) | 4th 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 | 30 | 428.7 hours | 99.2% | Official data |
| 2024 | 81 | 1,094.3 hours | 96.6% | Official data |
| 2023 | 44 | 82.6 hours | 99.4% | Official data |
| 2022 | 65 | 441.8 hours | 68.2%Low coverage | Official data |
| 2021 | 99 | 1,364 hours | 99.5% | Official data |
| 2020 | 59 | 684.2 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
- Storm tank at a wastewater treatment works
- Permit
- T/45/45471/R
- Activity reference
- A2
- 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 “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 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 (6Dwf)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 (SSTO)
- Who operates Marehay STW (SSTO)?
- Severn Trent Water is the operator named in the annual record. The permit reference is T/45/45471/R.
- Where does Marehay STW (SSTO) 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 (SSTO) spill in 2025?
- The 2025 return records 30 counted spill events and 428.7 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 99.2% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Marehay STW (SSTO) 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 (SSTO)?
- 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 Marehay STW (SSTO) compare with other overflows?
- Marehay STW (SSTO) recorded 30 spills in 2025. That is more than 74% of the 14,239 overflows in England with a reported figure, and ranks 3,488th nationally. Among Severn Trent Water overflows it ranks 380th of 2,431; the median Severn Trent Water overflow recorded 8 spills. On the Bottle Brook Catchment (trib of Derwent) waterbody it ranks 4th 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.