Maidenhall Combined Sewer Overflow
Storm overflow operated by Anglian Water. The source names River Orwell T as the receiving water.
- 22
- Spills in 2025
- 13.9
- Recorded hours
- 100%
- Monitor operation
- 5
- Years listed
The reported spill count was 56 lower than in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
Maidenhall Combined Sewer Overflow recorded 22 spills in 2025. That is more than 65% of the 14,239 overflows in England with a reported figure, and ranks 4,697th nationally. Among Anglian Water overflows it ranks 249th of 1,438; the median Anglian Water overflow recorded 6 spills. On the Orwell waterbody it ranks 6th of 8.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 22 | 13.9 |
| England | 4,697th of 14,239 | 11 | 22.3 |
| Anglian Water | 249th of 1,438 | 6 | 13.5 |
| Orwell | 6th of 8 | 31.5 | 44.4 |
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
| Year | Spills | Duration | Monitor operation | Source |
|---|---|---|---|---|
| 2025 | 22 | 13.9 hours | 100% | Official data |
| 2024 | 78 | 175.8 hours | 100% | Official data |
| 2023 | 80 | 175.5 hours | 100% | Official data |
| 2022 | 16 | 10.1 hours | 86.7%Low coverage | Official data |
| 2021 | 16 | 11.3 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
- AW4TS1429
- Activity reference
- A1
- Grid reference
- TM1662042670
- Waterbody ID
- GB520503613601Official 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 2 km south of the Ipswich 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
- Ipswich-Wherstead Rd SpCurrent status unknown
Anglian Water · River Orwell
- East MaintenanceCurrent status unknown
Anglian Water · River Orwell
- Dock Street Pumping StationCurrent status unknown
Anglian Water · River Orwell
- Ipswich-Cliff Quay Raeburn StCurrent status unknown
Anglian Water · tidal River Orwell
Questions about Maidenhall Combined Sewer Overflow
- Who operates Maidenhall Combined Sewer Overflow?
- Anglian Water is the operator named in the annual record. The permit reference is AW4TS1429.
- Where does Maidenhall Combined Sewer Overflow discharge?
- The source names River Orwell T as the receiving water. This does not show how far a discharge travelled.
- How many times did Maidenhall Combined Sewer Overflow spill in 2025?
- The 2025 return records 22 counted spill events and 13.9 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 Maidenhall Combined Sewer Overflow 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 Maidenhall Combined Sewer Overflow?
- 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 Maidenhall Combined Sewer Overflow compare with other overflows?
- Maidenhall Combined Sewer Overflow recorded 22 spills in 2025. That is more than 65% of the 14,239 overflows in England with a reported figure, and ranks 4,697th nationally. Among Anglian Water overflows it ranks 249th of 1,438; the median Anglian Water overflow recorded 6 spills. On the Orwell waterbody it ranks 6th of 8. 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.