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Look Out for Harmful Algal Blooms When Recreating this Summer

When recreating on Montana's waterbodies, be on the lookout for harmful algal blooms (HABs) that can occur on Montana's lakes and reservoirs. HABs can release toxins that can impact human and animal health. Report suspected HABs at to help alert others and prevent illness.

How to identify a HAB:

• A coloration or scum in the water that can look like spilled paint, pea soup, or grass clippings.

• Often blue, green or red in color.

HABs can occur when certain water conditions (nutrient levels, sunlight and temperature) cause a rapid overgrowth of blue-green algae, also called cyanobac...

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