Castlehill — water body quality
near Lahardaun, Mayo
Castlehill is a river in Mayo, near Lahardaun, extending 24.0 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 |
|---|---|
| Castlehill | Moderate |
Overall status reflects the worst stretch (precautionary).
This water body
- Type
- River
- Length
- 24.0 km
- County
- Mayo
- Location
- 54.0359, -9.3488
Others in Mayo
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 EPA Water Framework Directive ecological status data © Environmental Protection Agency, licensed under CC-BY-4.0.