Leiston - Waterloo Avenue/Park Hill CSO
Storm overflow operated by Anglian Water. The source names Leiston Beck as the receiving water.
- 15
- Spills in 2025
- 12.8
- Recorded hours
- 82.8%
- Monitor operation
- 5
- Years listed
Checking the latest monitor report…
How it compares in 2025
Leiston - Waterloo Avenue/Park Hill CSO recorded 15 spills in 2025. That is more than 56% of the 14,239 overflows in England with a reported figure, and ranks 5,981st nationally. Among Anglian Water overflows it ranks 362nd of 1,438; the median Anglian Water overflow recorded 6 spills. On the Leiston Beck waterbody it ranks 5th of 12.
The monitor worked for 82.8% of 2025, so this count may be low and its rank may understate activity.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 15 | 12.8 |
| England | 5,981st of 14,239 | 11 | 22.3 |
| Anglian Water | 362nd of 1,438 | 6 | 13.5 |
| Leiston Beck | 5th of 12 | 11 | 6.1 |
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 | 15 | 12.8 hours | 82.8%Low coverage | Official data |
| 2024 | 22 | 12.8 hours | 100% | Official data |
| 2023 | 22 | 22 hours | 83%Low coverage | Official data |
| 2022 | 25 | 20.3 hours | 99.4% | Official data |
| 2021 | 28 | 20.8 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
- Storm overflow on the sewer network
- Permit
- EPRNB3696NC
- Activity reference
- A1
- Grid reference
- TM4523063300
- Waterbody ID
- GB105035046271Official 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 1.1 km north-east of the Leiston 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
- Leiston - Main Street #1 CSOCurrent status unknown
Anglian Water · Leiston Beck
- Leiston - Main Street #2 CSOCurrent status unknown
Anglian Water · Leiston Beck
- Leiston - Main Street #3 CSOCurrent status unknown
Anglian Water · Leiston Beck
- Leiston - Valley Road/Crown Street #2 CSOCurrent status unknown
Anglian Water · Leiston Beck
Questions about Leiston - Waterloo Avenue/Park Hill CSO
- Who operates Leiston - Waterloo Avenue/Park Hill CSO?
- Anglian Water is the operator named in the annual record. The permit reference is EPRNB3696NC.
- Where does Leiston - Waterloo Avenue/Park Hill CSO discharge?
- The source names Leiston Beck as the receiving water. This does not show how far a discharge travelled.
- How many times did Leiston - Waterloo Avenue/Park Hill CSO spill in 2025?
- The 2025 return records 15 counted spill events and 12.8 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 82.8% of the reporting period. Below 90%, some events can be missed, so the count and hours may understate activity.
- Is Leiston - Waterloo Avenue/Park Hill 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 Leiston - Waterloo Avenue/Park Hill 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 Leiston - Waterloo Avenue/Park Hill CSO compare with other overflows?
- Leiston - Waterloo Avenue/Park Hill CSO recorded 15 spills in 2025. That is more than 56% of the 14,239 overflows in England with a reported figure, and ranks 5,981st nationally. Among Anglian Water overflows it ranks 362nd of 1,438; the median Anglian Water overflow recorded 6 spills. On the Leiston Beck waterbody it ranks 5th of 12. 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.