Thornbury Storm Tank
Storm overflow operated by Wessex Water. The source names Severn Estuary(E) as the receiving water.
- 35
- Spills in 2025
- 688.8
- Recorded hours
- 99.6%
- Monitor operation
- 5
- Years listed
The reported spill count was 35 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
Thornbury Storm Tank recorded 35 spills in 2025. That is more than 78% of the 14,239 overflows in England with a reported figure, and ranks 2,896th nationally. Among Wessex Water overflows it ranks 240th of 1,332; the median Wessex Water overflow recorded 11 spills.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 35 | 688.8 |
| England | 2,896th of 14,239 | 11 | 22.3 |
| Wessex Water | 240th of 1,332 | 11 | 18.9 |
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 | 35 | 688.8 hours | 99.6% | Official data |
| 2024 | 70 | 1,385 hours | 99.7% | Official data |
| 2023 | 67 | 1,310.5 hours | 99.6% | Official data |
| 2022 | 15 | 246.9 hours | 99.3% | Official data |
| 2021 | Unknown | Unknown | Unknown | 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
- Wessex Water
- Outlet type
- Storm tank at a wastewater treatment works
- Permit
- 102442
- Activity reference
- 2-SETTLEMENT TREATMENT ONLY
- Grid reference
- ST6280092340
- Waterbody ID
- GB109054026670Official 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 1.7 km east of the Oldbury-on-Severn 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
- Cromhall Jubilee LaneCurrent status unknown
Wessex Water · The Dyer'S Brake(S)
- Lydney STW (SSTO)Current status unknown
Severn Trent Water · River Severn Estuary
- Alvington - St Annes Well (CSO)Current status unknown
Severn Trent Water · Cone Brook
- Berkeley Park View RoadCurrent status unknown
Wessex Water · The Berkeley Pill
Questions about Thornbury Storm Tank
- Who operates Thornbury Storm Tank?
- Wessex Water is the operator named in the annual record. The permit reference is 102442.
- Where does Thornbury Storm Tank discharge?
- The source names Severn Estuary(E) as the receiving water. This does not show how far a discharge travelled.
- How many times did Thornbury Storm Tank spill in 2025?
- The 2025 return records 35 counted spill events and 688.8 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 99.6% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Thornbury Storm Tank 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 Thornbury Storm Tank?
- 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 Thornbury Storm Tank compare with other overflows?
- Thornbury Storm Tank recorded 35 spills in 2025. That is more than 78% of the 14,239 overflows in England with a reported figure, and ranks 2,896th nationally. Among Wessex Water overflows it ranks 240th of 1,332; the median Wessex Water overflow recorded 11 spills. 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.