Alfreton STW (CSO)

Storm overflow operated by Severn Trent Water. The source names Alfreton Brook as the receiving water.

30
Spills in 2025: 323.2
Recorded hours: 99.6%
Monitor operation: 5
Years listed

Current status unknown

Checking the latest monitor report…

How it compares in 2025

Alfreton STW (CSO) 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 Alfreton Brook from Westwood Brook to Amber waterbody it ranks 3rd of 6.

Group	Rank by spills	Median spills	Median hours
This outlet	–	30	323.2
England	3,488th of 14,239	11	22.3
Severn Trent Water	380th of 2,431	8	16.2
Alfreton Brook from Westwood Brook to Amber	3rd of 6	27.5	123.4

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

From 2020 to 2025, the reported count went from 23 to 30 spills. The highest count was 76 in 2023 and the lowest was 15 in 2022. The monitor worked for less than 90% of 2023, 2024, so those counts may be low.Amber bars mark years when the monitor worked for less than 90% of the year.

Year	Spills	Duration	Monitor operation	Source
2025	30	323.2 hours	99.6%	Official data
2024	43	421.5 hours	82.1%Low coverage	Official data
2023	76	1,002.8 hours	89.8%Low coverage	Official data
2022	15	18.6 hours	100%	Official data
2020	23	95.2 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/41/45824/R
Activity reference: A3
Grid reference: SK4121856847
Waterbody ID: GB104028052320Official 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 1.2 km north of the Alfreton reference point in the ONS built-up areas data.

Area and water pages

Alfreton Brook from Westwood Brook to Amber waterbody →

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 STW (SSTO)
Severn Trent Water · Alfreton Brook
Current status unknown

Alfreton - Lydford Road (CSO)
Severn Trent Water · Alfreton Brook
Current status unknown
Alfreton - Meadow Lane (SSO)
Severn Trent Water · Tributary of Alfreton Brook
Current status unknown
Alfreton - Brook Avenue (CSO)
Severn Trent Water · Oakerthorpe Brook
Current status unknown

Questions about Alfreton STW (CSO)

Who operates Alfreton STW (CSO)?: Severn Trent Water is the operator named in the annual record. The permit reference is T/41/45824/R.
Where does Alfreton STW (CSO) discharge?: The source names Alfreton Brook as the receiving water. This does not show how far a discharge travelled.
How many times did Alfreton STW (CSO) spill in 2025?: The 2025 return records 30 counted spill events and 323.2 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 99.6% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
Is Alfreton 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 Alfreton 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 Alfreton STW (CSO) compare with other overflows?: Alfreton STW (CSO) 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 Alfreton Brook from Westwood Brook to Amber waterbody it ranks 3rd of 6. 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.