Holbrook STW, Anglian Water (AW2NF185 · A2 · AWS00604)
Storm overflow operated by Anglian Water. The source names Trib Holbrook Stream as the receiving water.
- 28
- Spills in 2025
- 62.5
- Recorded hours
- 99.8%
- Monitor operation
- 5
- Years listed
The reported spill count was 10 lower than in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
Holbrook STW, Anglian Water (AW2NF185 · A2 · AWS00604) recorded 28 spills in 2025. That is more than 72% of the 14,239 overflows in England with a reported figure, and ranks 3,771st nationally. Among Anglian Water overflows it ranks 170th of 1,438; the median Anglian Water overflow recorded 6 spills. On the Stour (Essex) waterbody it ranks 1st of 9.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 28 | 62.5 |
| England | 3,771st of 14,239 | 11 | 22.3 |
| Anglian Water | 170th of 1,438 | 6 | 13.5 |
| Stour (Essex) | 1st of 9 | 4 | 2.5 |
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 | 28 | 62.5 hours | 99.8% | Official data |
| 2024 | 38 | 82.5 hours | 100% | Official data |
| 2023 | 4 | 2.5 hours | 100% | Official data |
| 2022 | Unknown | Unknown | Unknown | Official data |
| 2021 | Unknown | Unknown | Unknown | 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
- Anglian Water
- Outlet type
- Inlet storm overflow at a wastewater treatment works
- Permit
- AW2NF185
- Activity reference
- A2
- Grid reference
- TM1682035870
- Waterbody ID
- GB520503613602Official 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 0.9 km north-east of the Holbrook (Babergh) 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
- Holbrook STWCurrent status unknown
Anglian Water · Holbrook Creek Estuary Stour
- Mistley, School Lane CSOCurrent status unknown
Anglian Water · River Stour
- Brantham School Lane SpCurrent status unknown
Anglian Water · Trib River Stour
- Brantham Factory Lane OVCurrent status unknown
Anglian Water · Trib River Stour
Questions about Holbrook STW, Anglian Water (AW2NF185 · A2 · AWS00604)
- Who operates Holbrook STW, Anglian Water (AW2NF185 · A2 · AWS00604)?
- Anglian Water is the operator named in the annual record. The permit reference is AW2NF185.
- Where does Holbrook STW, Anglian Water (AW2NF185 · A2 · AWS00604) discharge?
- The source names Trib Holbrook Stream as the receiving water. This does not show how far a discharge travelled.
- How many times did Holbrook STW, Anglian Water (AW2NF185 · A2 · AWS00604) spill in 2025?
- The 2025 return records 28 counted spill events and 62.5 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 99.8% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Holbrook STW, Anglian Water (AW2NF185 · A2 · AWS00604) 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 Holbrook STW, Anglian Water (AW2NF185 · A2 · AWS00604)?
- 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 Holbrook STW, Anglian Water (AW2NF185 · A2 · AWS00604) compare with other overflows?
- Holbrook STW, Anglian Water (AW2NF185 · A2 · AWS00604) recorded 28 spills in 2025. That is more than 72% of the 14,239 overflows in England with a reported figure, and ranks 3,771st nationally. Among Anglian Water overflows it ranks 170th of 1,438; the median Anglian Water overflow recorded 6 spills. On the Stour (Essex) waterbody it ranks 1st 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.