A news release from the Panhandle Health District:

Health advisories for Fernan Lake and Black Lake have been lifted by Panhandle Health District and Idaho Department of Environmental Quality (DEQ). The advisories were issued due to high concentrations of blue-green algae that can produce toxins harmful to humans and animals. DEQ officials have confirmed the blue-green algae concentrations have cleared and are no longer a concern. Fernan and Black Lakes are safe again for fishing, swimming and domestic water supply use with the appropriate water treatment technology. The public should continue to avoid any floating surface scum and contact DEQ at (208) 769-1422 to report any concerns. Currently, there are not any lakes under health advisories in Idaho’s five northern counties.