Cotton Valley STW
Storm overflow operated by Anglian Water. The source names River Great Ouse/RIVER Ouzel as the receiving water.
- 2
- Spills in 2025
- 16.3
- Recorded hours
- 100%
- Monitor operation
- 5
- Years listed
The reported spill count was 28 lower than in 2024. This compares event counts, not discharge volume.
We do not have a live report for this outlet. Its annual spill records are shown below.
How it compares in 2025
Cotton Valley STW recorded 2 spills in 2025. That is more than 21% of the 14,239 overflows in England with a reported figure, and ranks 10,428th nationally. Among Anglian Water overflows it ranks 959th of 1,438; the median Anglian Water overflow recorded 6 spills. On the Ouse (Newport Pagnell to Roxton) waterbody it ranks 12th of 16.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 2 | 16.3 |
| England | 10,428th of 14,239 | 11 | 22.3 |
| Anglian Water | 959th of 1,438 | 6 | 13.5 |
| Ouse (Newport Pagnell to Roxton) | 12th of 16 | 6 | 17.3 |
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 | 2 | 16.3 hours | 100% | Official data |
| 2024 | 30 | 361.5 hours | 100% | Official data |
| 2023 | 8 | 74.5 hours | 100% | Official data |
| 2022 | 1 | 0.5 hours | 100% | Official data |
| 2021 | 10 | 68.8 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 tank at a wastewater treatment works
- Permit
- AWCNF10296
- Activity reference
- A2
- Grid reference
- SP8841045220
- Waterbody ID
- GB105033047923Official 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 “Storm tank at WwTW”: storm tank at a wastewater treatment works. The overflow comes from storm storage at a treatment 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 1.4 km south-west of the Sherington 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
- Sherington-Water Lane SSOCurrent status unknown
Anglian Water · tributary River Great Ouse
- Sherington STWCurrent status unknown
Anglian Water · River Great Ouse NT
- Newport Pagnell-Willen Rd TpsCurrent status unknown
Anglian Water · River Ouzel
- Filgrave STWCurrent status unknown
Anglian Water · Tributary River Great Ouse NT
Questions about Cotton Valley STW
- Who operates Cotton Valley STW?
- Anglian Water is the operator named in the annual record. The permit reference is AWCNF10296.
- Where does Cotton Valley STW discharge?
- The source names River Great Ouse/RIVER Ouzel as the receiving water. This does not show how far a discharge travelled.
- How many times did Cotton Valley STW spill in 2025?
- The 2025 return records 2 counted spill events and 16.3 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 Cotton Valley STW discharging right now?
- This record is not matched to a company live feed, so we cannot show a current report. Only the annual figures are available for this outlet.
- 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 Cotton Valley STW?
- The annual return lists the asset type as “Storm tank at WwTW”, which means storm tank at a wastewater treatment works. The overflow comes from storm storage at a treatment works.
- How does Cotton Valley STW compare with other overflows?
- Cotton Valley STW recorded 2 spills in 2025. That is more than 21% of the 14,239 overflows in England with a reported figure, and ranks 10,428th nationally. Among Anglian Water overflows it ranks 959th of 1,438; the median Anglian Water overflow recorded 6 spills. On the Ouse (Newport Pagnell to Roxton) waterbody it ranks 12th of 16. 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.