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The state Department of Environmental Quality has issued harmful algal bloom advisories for several bodies of water around Helena. But a water-borne parasite could also be the culprit behind the itching and rashes some swimmers are reporting.
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A section of the Hebgen Reservoir near West Yellowstone is closed due to a toxic algae bloom.
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The Gallatin City-County Health Department recently detected a toxic algae bloom in a privately-owned pond in Bozeman. It’s the first one in the county this year.