Derriaghy River — water body quality
near Lambeg, Lisburn and Castlereagh
Derriaghy River is a river in Lisburn and Castlereagh, near Lambeg, extending 6.4 km.
Official classification
Moderate
Assessed 2026
Moderate is the first Water Framework Directive class that falls short of the Directive’s objective: the biological communities here differ moderately from those expected in a near-natural water body of this type, so a programme of measures applies.
| Stretch | Status |
|---|---|
| Derriaghy River | Moderate |
Overall status reflects the worst stretch (precautionary).
This water body
- Type
- River
- Length
- 6.4 km
- County
- Lisburn and Castlereagh
- Location
- 54.5464, -6.0349
Others in Lisburn and Castlereagh
This page shows water-quality information, not swim-safety advice. For today's conditions and swim-safety guidance, check Water Safety Ireland.
Official classifications on this page contain DAERA/NIEA Water Framework Directive classification data © Crown copyright, licensed under Open Government Licence v3.0.