05/27/2026
PUBLIC HEALTH ADVISORY: Harmful Algal Bloom Suspected at Hubscher Park
A harmful algal bloom is suspected at Paul Hubscher Park in Sumner after testing showed the presence of microcystin, prompting the Mid-Michigan District Health Department (MMDHD) to recommend people and pets avoid affected areas of the lake.
The advisory was issued Wednesday after routine beach monitoring at the county park, according to Brady Guilbault, public information officer for MMDHD.
Microcystin is a toxin produced by some blue-green algae that can pose health risks to people and animals, particularly if contaminated water is swallowed.
Algae are naturally occurring plant-like organisms found in water, but blooms can form quickly during periods of warm temperatures, sun and high nutrient levels, Guilbault said. They can appear as foam, scum, surface mats, clumps, a green sheen or streaks that look like spilled paint.
Most blooms are harmless, but some produce toxins poisonous to humans, animals and aquatic life. Because harmful blooms cannot always be identified by sight, Guilbault advises people to stay out of the water when there is any doubt.
Visitors should obey posted advisory signs or beach closings, keep away from affected water and shoreline, and rinse with fresh water after any contact with affected areas, he said.
Exposure can cause diarrhea, vomiting, stomach pain, headache, weakness, numbness, tingling fingers, dizziness, difficulty breathing, asthma-like symptoms, runny eyes and nose, allergic reactions and sore throat, Guilbault said. Skin contact can cause rashes, blisters or hives. Anyone who develops symptoms should contact a doctor.
Animals, especially dogs, can become ill or die after exposure. Signs of illness include vomiting, diarrhea, staggered walking and convulsions.