Portishead Black Nore (Nautical School)
Storm overflow operated by Wessex Water. The source names Severn Estuary as the receiving water.
- 36
- Spills in 2025
- 138.6
- Recorded hours
- 99.9%
- Monitor operation
- 4
- Years listed
The reported spill count was 9 lower than in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
Portishead Black Nore (Nautical School) recorded 36 spills in 2025. That is more than 79% of the 14,239 overflows in England with a reported figure, and ranks 2,801st nationally. Among Wessex Water overflows it ranks 231st of 1,332; the median Wessex Water overflow recorded 11 spills. On the Bristol Avon waterbody it ranks 8th of 70.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 36 | 138.6 |
| England | 2,801st of 14,239 | 11 | 22.3 |
| Wessex Water | 231st of 1,332 | 11 | 18.9 |
| Bristol Avon | 8th of 70 | 12 | 5.2 |
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 | 36 | 138.6 hours | 99.9% | Official data |
| 2024 | 45 | 205.2 hours | 99.9% | Official data |
| 2023 | 51 | 156.8 hours | 99.9% | Official data |
| 2022 | 28 | 43.8 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
- Wessex Water
- Outlet type
- Storm discharge at a pumping station
- Permit
- 071587
- Activity reference
- 1-STORM/EMERGENCY
- Grid reference
- ST4445276495
- Waterbody ID
- GB530905415405Official 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 discharge at pumping station”: storm discharge at a pumping station. The overflow is at a pumping station that moves sewage through the 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 2.2 km west of the Portishead 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
- Portishead Hillside Road Redcliff BayCurrent status unknown
Wessex Water · River Severn (Estuarine)
- Clevedon Ladye BayCurrent status unknown
Wessex Water · Bristol Channel (E)
- Clevedon Marine ParadeCurrent status unknown
Wessex Water · Severn Estuary(E)
- Clevedon Old Street O/S 46Current status unknown
Wessex Water · Land Yeo (S)
Questions about Portishead Black Nore (Nautical School)
- Who operates Portishead Black Nore (Nautical School)?
- Wessex Water is the operator named in the annual record. The permit reference is 071587.
- Where does Portishead Black Nore (Nautical School) discharge?
- The source names Severn Estuary as the receiving water. This does not show how far a discharge travelled.
- How many times did Portishead Black Nore (Nautical School) spill in 2025?
- The 2025 return records 36 counted spill events and 138.6 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 99.9% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Portishead Black Nore (Nautical School) 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 Portishead Black Nore (Nautical School)?
- The annual return lists the asset type as “Storm discharge at pumping station”, which means storm discharge at a pumping station. The overflow is at a pumping station that moves sewage through the network.
- How does Portishead Black Nore (Nautical School) compare with other overflows?
- Portishead Black Nore (Nautical School) recorded 36 spills in 2025. That is more than 79% of the 14,239 overflows in England with a reported figure, and ranks 2,801st nationally. Among Wessex Water overflows it ranks 231st of 1,332; the median Wessex Water overflow recorded 11 spills. On the Bristol Avon waterbody it ranks 8th of 70. 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.