Allegan County Health Department Raises Swan Lake Advisory | WKZO | All Kalamazoo

ALLEGAN, MI (WKZO AM / FM) – Recent results from the Michigan Department of the Environment, Great Lakes and Energy (EGLE) test strips at Swan Lake on Nov. 18 showed that microcystin levels were no longer being detected.

No proliferation of cyanobacteria was still present during EGLE at the time of collection. The public health notice issued on August 4, 2021 for Swan Lake has been lifted.

Harmful algae flowers. (Photo courtesy of Michigan Department of the Environment, Great Lakes, and Energy (EGLE)).

ACHD first received a notification from EGLE of a suspected blue-green algae in Swan Lake on August 4, and a confirmation of the presence of the algae toxin microcystin on August 6.

Warning signs had been placed near the campground and boat launch, urging people and pets to stay out of the water.

As winter activities approach, CDHA reminds those who participate in such activities that cyanotoxins can accumulate in the flesh of fish, especially in the intestines or organs (liver, kidneys, etc.).

The amount of toxin found in fish depends on a number of factors, including the intensity and duration of the cyanobacteria bloom in the area where the fish are caught.

Those who eat fish should follow the Eat Safe Fish Waterspecific Guidelines, or statewide fish safety guidelines.

Although algae blooms in winter are not common, any drastic changes in water color (including red and green) should be reported to the state.

Suspicious-looking algae can be reported to EGLE by calling the Environmental Assistance Center at 1-800-662-9278 or by emailing [email protected].

CDHA will no longer provide updates on Swan Lake, unless there are reports of concern for new HABs. For more information on HABs, visit www.michigan.gov/habs.


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