Harleston STW, Anglian Water (AW4NF/533 · A3 · AWS00561)
Storm overflow operated by Anglian Water. The source names Starston Beck River Waveney N as the receiving water.
- 12
- Spills in 2025
- 13.3
- Recorded hours
- 100%
- Monitor operation
- 2
- Years listed
The reported spill count was the same as in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
Harleston STW, Anglian Water (AW4NF/533 · A3 · AWS00561) recorded 12 spills in 2025. That is more than 51% of the 14,239 overflows in England with a reported figure, and ranks 6,643rd nationally. Among Anglian Water overflows it ranks 441st of 1,438; the median Anglian Water overflow recorded 6 spills. On the Starston Brook waterbody it ranks 1st of 3.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 12 | 13.3 |
| England | 6,643rd of 14,239 | 11 | 22.3 |
| Anglian Water | 441st of 1,438 | 6 | 13.5 |
| Starston Brook | 1st of 3 | 6 | 24.1 |
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 | 12 | 13.3 hours | 100% | Official data |
| 2024 | 12 | 10 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
- Anglian Water
- Outlet type
- Inlet storm overflow at a wastewater treatment works
- Permit
- AW4NF/533
- Activity reference
- A3
- Grid reference
- TM2501084020
- Waterbody ID
- GB105034045880Official 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 1 km north-east of the Harleston 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
- Harleston STWCurrent status unknown
Anglian Water · Starston Beck River Waveney N
- Pulham St Mary STWCurrent status unknown
Anglian Water · Starston Beck
- Long Stratton STWCurrent status unknown
Anglian Water · Tributary River Tas NT
- Saxlingham STWCurrent status unknown
Anglian Water · tributary River Tas
Questions about Harleston STW, Anglian Water (AW4NF/533 · A3 · AWS00561)
- Who operates Harleston STW, Anglian Water (AW4NF/533 · A3 · AWS00561)?
- Anglian Water is the operator named in the annual record. The permit reference is AW4NF/533.
- Where does Harleston STW, Anglian Water (AW4NF/533 · A3 · AWS00561) discharge?
- The source names Starston Beck River Waveney N as the receiving water. This does not show how far a discharge travelled.
- How many times did Harleston STW, Anglian Water (AW4NF/533 · A3 · AWS00561) spill in 2025?
- The 2025 return records 12 counted spill events and 13.3 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 Harleston STW, Anglian Water (AW4NF/533 · A3 · AWS00561) 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 Harleston STW, Anglian Water (AW4NF/533 · A3 · AWS00561)?
- 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 Harleston STW, Anglian Water (AW4NF/533 · A3 · AWS00561) compare with other overflows?
- Harleston STW, Anglian Water (AW4NF/533 · A3 · AWS00561) recorded 12 spills in 2025. That is more than 51% of the 14,239 overflows in England with a reported figure, and ranks 6,643rd nationally. Among Anglian Water overflows it ranks 441st of 1,438; the median Anglian Water overflow recorded 6 spills. On the Starston Brook waterbody it ranks 1st of 3. 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.