Swilly (Donegal) — water body quality
near Letterkenny, Donegal
Swilly (Donegal) is a river in Donegal, near Letterkenny, extending 115.9 km.
Official classification
Good
Assessed 2026
Good ecological status under the Water Framework Directive means the biology and chemistry of this water body depart only slightly from near-natural conditions for its type, which meets the Directive’s environmental objective.
| Stretch | Status |
|---|---|
| Swilly (Donegal) | Good |
Overall status reflects the worst stretch (precautionary).
This water body
- Type
- River
- Length
- 115.9 km
- County
- Donegal
- Location
- 54.9393, -7.7567
Others in Donegal
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.