St Marys Primary School CSO
Storm overflow operated by Northumbrian Water. The source names Backstone Burn (Derwent) as the receiving water.
- 0
- Spills in 2025
- 0
- Recorded hours
- 98.9%
- Monitor operation
- 2
- 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
St Marys Primary School CSO recorded no spills in 2025. It is one of 2,231 overflows in England with a reported count of zero, out of 14,239 with a count.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 0 | 0 |
| England | 12,009th of 14,239 | 11 | 22.3 |
| Northumbrian Water | 1,305th of 1,559 | 11 | 15.6 |
| Derwent from Burnhope Burn to River Tyne | 43rd of 55 | 5 | 1.6 |
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 | 0 | 0 hours | 98.9% | Official data |
| 2024 | 9 | 3.5 hours | 97.2% | 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
- Northumbrian Water
- Outlet type
- Storm overflow on the sewer network
- Permit
- 234/1173
- Activity reference
- A1
- Grid reference
- NZ0894652307
- Waterbody ID
- GB103023074790Official 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 2.1 km north-west of the Consett 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
- Cutlers Hall Road (No. 29) StormCurrent status unknown
Northumbrian Water · Backstone Beck Tributary of R.DERWE
- Consett Oap Hall CSOCurrent status unknown
Northumbrian Water · Backstone Burn
- Rear 39 Cutlers Hall RoadCurrent status unknown
Northumbrian Water · Backstone Burn
- Shotley Bridge CSO Der0004Current status unknown
Northumbrian Water · Tributary of River Derwent
Questions about St Marys Primary School CSO
- Who operates St Marys Primary School CSO?
- Northumbrian Water is the operator named in the annual record. The permit reference is 234/1173.
- Where does St Marys Primary School CSO discharge?
- The source names Backstone Burn (Derwent) as the receiving water. This does not show how far a discharge travelled.
- How many times did St Marys Primary School CSO spill in 2025?
- The 2025 return records 0 counted spill events and 0 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 98.9% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is St Marys Primary School CSO 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 St Marys Primary School CSO?
- 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 St Marys Primary School CSO compare with other overflows?
- St Marys Primary School CSO recorded no spills in 2025. It is one of 2,231 overflows in England with a reported count of zero, out of 14,239 with a count. 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.