Drayton Parslow STW
Storm overflow operated by Anglian Water. The source names Tributary River Ouzel as the receiving water.
- 55
- Spills in 2025
- 164.5
- Recorded hours
- 100%
- Monitor operation
- 5
- Years listed
The reported spill count was 67 lower than in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
Drayton Parslow STW recorded 55 spills in 2025. That is more than 90% of the 14,239 overflows in England with a reported figure, and ranks 1,343rd nationally. Among Anglian Water overflows it ranks 46th of 1,438; the median Anglian Water overflow recorded 6 spills. On the Ouzel US Caldecote Mill waterbody it ranks 1st of 5.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 55 | 164.5 |
| England | 1,343rd of 14,239 | 11 | 22.3 |
| Anglian Water | 46th of 1,438 | 6 | 13.5 |
| Ouzel US Caldecote Mill | 1st of 5 | 16 | 49.3 |
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 | 55 | 164.5 hours | 100% | Official data |
| 2024 | 122 | 350.3 hours | 93.9% | Official data |
| 2023 | 73 | 382.4 hours | 100% | Official data |
| 2022 | 47 | 139.3 hours | 100% | Official data |
| 2021 | 17 | 288.9 hours | 17.9%Low coverage | 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
- Other storm discharge asset type, with treatment
- Permit
- AW1NF/1451
- Activity reference
- A2
- Grid reference
- SP8485028730
- Waterbody ID
- GB105033037971Official 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 “Other storm discharge asset type - with treatment”: other storm discharge asset type, with treatment. The return uses its general category for this asset. The return records this variant as discharging with treatment.
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 0.8 km east of the Drayton Parslow 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
- Newton Longville-Whaddon Rd SpCurrent status unknown
Anglian Water · Trib Newton Longville Brook
- Stewkley STWCurrent status unknown
Thames Water · Hardwick Brook
- Bletchley-Selbourne Avenue SpCurrent status unknown
Anglian Water · Newton Longville Brook
- Great Brickhill STWCurrent status unknown
Anglian Water · Brickhill Brook River Ouzel NT
Questions about Drayton Parslow STW
- Who operates Drayton Parslow STW?
- Anglian Water is the operator named in the annual record. The permit reference is AW1NF/1451.
- Where does Drayton Parslow STW discharge?
- The source names Tributary River Ouzel as the receiving water. This does not show how far a discharge travelled.
- How many times did Drayton Parslow STW spill in 2025?
- The 2025 return records 55 counted spill events and 164.5 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 100% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Drayton Parslow STW 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 Drayton Parslow STW?
- The annual return lists the asset type as “Other storm discharge asset type - with treatment”, which means other storm discharge asset type, with treatment. The return uses its general category for this asset. The return records this variant as discharging with treatment.
- How does Drayton Parslow STW compare with other overflows?
- Drayton Parslow STW recorded 55 spills in 2025. That is more than 90% of the 14,239 overflows in England with a reported figure, and ranks 1,343rd nationally. Among Anglian Water overflows it ranks 46th of 1,438; the median Anglian Water overflow recorded 6 spills. On the Ouzel US Caldecote Mill waterbody it ranks 1st of 5. 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.