Fish generally require a dissolved oxygen level of between 5.5 to 9.5 mg.L-1 (warm to cold water) to survive. On September 10, 2014, the Ministry of the Environment collected samples from Loon Lake for extensive testing of the water quality. This testing did not reveal any significant problems in Loon Lake. Of particular interest was their measurement of Dissolved Oxygen levels at the surface and at intervals down to 28 meters.
The below results show healthy levels of Dissolved Oxygen, even across the thermocline (drop in temperature) and at the bottom of one of the deepest parts of the lake.