Stonyford Reservoir — water body quality
near Lambeg, Lisburn and Castlereagh
Stonyford Reservoir is a lake in Lisburn and Castlereagh, near Lambeg, covering 53.7 ha.
Official classification
Poor
Assessed 2026
Poor ecological status means the Water Framework Directive assessment found major alteration to this water body’s biological communities, with many of the species expected in an undisturbed water body of its type absent or much reduced.
| Stretch | Status |
|---|---|
| Stonyford Reservoir | Poor |
Overall status reflects the worst stretch (precautionary).
This water body
- Type
- Lake
- Area
- 53.7 ha
- County
- Lisburn and Castlereagh
- Location
- 54.5605, -6.1184
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.