Portnashangan, Lough Owel was rated Excellent Quality for 2025 — the highest of the four grades in the Bathing Water Regulations. That grade comes from bacterial samples taken over several seasons, so it describes the beach's record rather than the water on any given day.
The local authority publishes bathing restrictions and sample results for this beach. There is no storm overflow monitoring anywhere in Ireland, so sewage discharges cannot be checked here at all.