Alfreton - Trent Grove 11 (CSO)
Storm overflow operated by Severn Trent Water. The source names Oakerthorpe Brook as the receiving water.
- 41
- Spills in 2025
- 171
- Recorded hours
- 100%
- Monitor operation
- 2
- Years listed
The reported spill count was 2 lower than in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
Alfreton - Trent Grove 11 (CSO) recorded 41 spills in 2025. That is more than 83% of the 14,239 overflows in England with a reported figure, and ranks 2,313th nationally. Among Severn Trent Water overflows it ranks 228th of 2,431; the median Severn Trent Water overflow recorded 8 spills. On the Amber from Alfreton Brook to Derwent waterbody it ranks 7th of 27.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 41 | 171 |
| England | 2,313th of 14,239 | 11 | 22.3 |
| Severn Trent Water | 228th of 2,431 | 8 | 16.2 |
| Amber from Alfreton Brook to Derwent | 7th of 27 | 23 | 98.5 |
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 | 41 | 171 hours | 100% | Official data |
| 2024 | 43 | 174.3 hours | 94.4% | 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 overflow on the sewer network
- Permit
- T/41/45490/O
- Activity reference
- A1
- Grid reference
- SK4111054960
- Waterbody ID
- GB104028052330Official 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 “SO on sewer network”: storm overflow on the sewer network. The return places this overflow on the sewer 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 0.8 km south-west of the Alfreton 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
- Alfreton - Brook Avenue (CSO)Current status unknown
Severn Trent Water · Oakerthorpe Brook
- Alfreton - Eachwells Lane (So)Current status unknown
Severn Trent Water · Tributary of Oakerthorpe Brook
- Alfreton - Highfields (SSO)Current status unknown
Severn Trent Water · Tributary of Alfreton Brook
- Alfreton - Meadow Lane (SSO)Current status unknown
Severn Trent Water · Tributary of Alfreton Brook
Questions about Alfreton - Trent Grove 11 (CSO)
- Who operates Alfreton - Trent Grove 11 (CSO)?
- Severn Trent Water is the operator named in the annual record. The permit reference is T/41/45490/O.
- Where does Alfreton - Trent Grove 11 (CSO) discharge?
- The source names Oakerthorpe Brook as the receiving water. This does not show how far a discharge travelled.
- How many times did Alfreton - Trent Grove 11 (CSO) spill in 2025?
- The 2025 return records 41 counted spill events and 171 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 Alfreton - Trent Grove 11 (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 Alfreton - Trent Grove 11 (CSO)?
- The annual return lists the asset type as “SO on sewer network”, which means storm overflow on the sewer network. The return places this overflow on the sewer network.
- How does Alfreton - Trent Grove 11 (CSO) compare with other overflows?
- Alfreton - Trent Grove 11 (CSO) recorded 41 spills in 2025. That is more than 83% of the 14,239 overflows in England with a reported figure, and ranks 2,313th nationally. Among Severn Trent Water overflows it ranks 228th of 2,431; the median Severn Trent Water overflow recorded 8 spills. On the Amber from Alfreton Brook to Derwent waterbody it ranks 7th of 27. 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.