MANDAN, N.D. - The Department of Environmental Quality posted a water advisory for Harmon Lake on July 3 after scientists found the water may contain blue-green algae.
Aaron Larson, an environmental scientist for the watershed program, says its not a quick fix, and the procedure is to monitor the waters weekly.
He says the lake must be cyanotoxin free for at least 2 weeks before its safe for the public.
The Department of Environmental Quality leaders say blue-green algae may be harmful to humans and animals.
They say not to swim near water that looks like spilled green paint or pea soup and avoid swallowing it.
They also say people should rinse off with clean water after swimming and steer clear when boating.