Grindleford (SSO)
Storm overflow operated by Severn Trent Water. The source names River Trent as the receiving water.
- 35
- Spills in 2025
- 251
- Recorded hours
- 77.9%
- Monitor operation
- 6
- Years listed
Checking the latest monitor report…
How it compares in 2025
Grindleford (SSO) recorded 35 spills in 2025. That is more than 78% of the 14,239 overflows in England with a reported figure, and ranks 2,896th nationally. Among Severn Trent Water overflows it ranks 293rd of 2,431; the median Severn Trent Water overflow recorded 8 spills. On the Derwent from Westend to Wye waterbody it ranks 5th of 9.
The monitor worked for 77.9% of 2025, so this count may be low and its rank may understate activity.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 35 | 251 |
| England | 2,896th of 14,239 | 11 | 22.3 |
| Severn Trent Water | 293rd of 2,431 | 8 | 16.2 |
| Derwent from Westend to Wye | 5th of 9 | 35 | 41.6 |
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 | 35 | 251 hours | 77.9%Low coverage | Official data |
| 2024 | 24 | 94.9 hours | 100% | Official data |
| 2023 | 28 | 217.4 hours | 99.9% | Official data |
| 2022 | 39 | 250 hours | 99.5% | Official data |
| 2021 | 52 | 563 hours | 96.3% | Official data |
| 2020 | 44 | 404.6 hours | 99.9% | 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 discharge at a pumping station
- Permit
- T/38/40242/O
- Activity reference
- A1
- Grid reference
- SK2436077350
- Waterbody ID
- GB104028057880Official 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 1.1 km south of the Grindleford 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
- Calver - Sheffield Road (CSO)Current status unknown
Severn Trent Water · Dale Brook
- Curbar - Riddings Lane (CSO)Current status unknown
Severn Trent Water · River Derwent
- Hathersage STW (SSTO)Current status unknown
Severn Trent Water · River Derwent
- Hathersage - Mill Lane (Mill Cott) (CSO)Current status unknown
Severn Trent Water · Hood Brook
Questions about Grindleford (SSO)
- Who operates Grindleford (SSO)?
- Severn Trent Water is the operator named in the annual record. The permit reference is T/38/40242/O.
- Where does Grindleford (SSO) discharge?
- The source names River Trent as the receiving water. This does not show how far a discharge travelled.
- How many times did Grindleford (SSO) spill in 2025?
- The 2025 return records 35 counted spill events and 251 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 77.9% of the reporting period. Below 90%, some events can be missed, so the count and hours may understate activity.
- Is Grindleford (SSO) 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 Grindleford (SSO)?
- 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 Grindleford (SSO) compare with other overflows?
- Grindleford (SSO) recorded 35 spills in 2025. That is more than 78% of the 14,239 overflows in England with a reported figure, and ranks 2,896th nationally. Among Severn Trent Water overflows it ranks 293rd of 2,431; the median Severn Trent Water overflow recorded 8 spills. On the Derwent from Westend to Wye waterbody it ranks 5th of 9. 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.