ALLEGAN COUNTY, Mich. (Michigan News Source) – The Allegan County Health Department has confirmed that Swan Lake contains a harmful bloom of blue-green algae.

The Michigan Department of Environment, Great Lakes, and Energy (EGLE) tested samples of the algae bloom collected in late July, which came back positive for the presence of algal toxin microcystin.

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People and pets should avoid contact with Swan Lake where the bloom is visible until it has dissipated or is gone entirely.