Mount Pleasant CSO Der41
Storm overflow operated by Northumbrian Water. The source names Smallhope Burn as the receiving water.
- 29
- Spills in 2025
- 28.7
- Recorded hours
- 99.9%
- Monitor operation
- 2
- Years listed
The reported spill count was 2 higher than in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
Mount Pleasant CSO Der41 recorded 29 spills in 2025. That is more than 73% of the 14,239 overflows in England with a reported figure, and ranks 3,624th nationally. Among Northumbrian Water overflows it ranks 353rd of 1,559; the median Northumbrian Water overflow recorded 11 spills. On the Smallhope Burn from Source to Browney, Stocke waterbody it ranks 8th of 15.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 29 | 28.7 |
| England | 3,624th of 14,239 | 11 | 22.3 |
| Northumbrian Water | 353rd of 1,559 | 11 | 15.6 |
| Smallhope Burn from Source to Browney, Stocke | 8th of 15 | 29 | 31.8 |
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 | 29 | 28.7 hours | 99.9% | Official data |
| 2024 | 27 | 48.3 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
- Northumbrian Water
- Outlet type
- Storm overflow on the sewer network
- Permit
- 244/1020
- Activity reference
- A1
- Grid reference
- NZ1639647567
- Waterbody ID
- GB103024077330Official 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 0.2 km north-west of the Lanchester reference point in the ONS built-up areas data.
Area and water pages
- Burnopfield area →
- Beamish area →
- Whitehill (County Durham) area →
- Hobson area →
- Tanfield Lea area →
- Sacriston area →
- Nettlesworth and Kimblesworth area →
- Tantobie area →
- Newfield area →
- West Pelton area →
- Witton Gilbert area →
- Craghead area →
- Ushaw Moor and Bearpark area →
- Hamsterley Mill area →
- Stanley (County Durham) area →
- Langley Park area →
- Dipton area →
- New Brancepeth area →
- Annfield Plain area →
- Smallhope Burn from Source to Browney, Stocke waterbody →
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
- Railway Sreet CSOCurrent status unknown
Northumbrian Water · Smallhope Burn
- Lynwood House CSO Der44Current status unknown
Northumbrian Water · Smallhope Burn
- CSO Manor CourtCurrent status unknown
Northumbrian Water · Smallhope Burn
- Lanchester STWCurrent status unknown
Northumbrian Water · Smallhope Burn
Questions about Mount Pleasant CSO Der41
- Who operates Mount Pleasant CSO Der41?
- Northumbrian Water is the operator named in the annual record. The permit reference is 244/1020.
- Where does Mount Pleasant CSO Der41 discharge?
- The source names Smallhope Burn as the receiving water. This does not show how far a discharge travelled.
- How many times did Mount Pleasant CSO Der41 spill in 2025?
- The 2025 return records 29 counted spill events and 28.7 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 Mount Pleasant CSO Der41 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 Mount Pleasant CSO Der41?
- 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 Mount Pleasant CSO Der41 compare with other overflows?
- Mount Pleasant CSO Der41 recorded 29 spills in 2025. That is more than 73% of the 14,239 overflows in England with a reported figure, and ranks 3,624th nationally. Among Northumbrian Water overflows it ranks 353rd of 1,559; the median Northumbrian Water overflow recorded 11 spills. On the Smallhope Burn from Source to Browney, Stocke waterbody it ranks 8th of 15. 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.