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Advisory: Confirmed Harmful Algal Bloom in Round Lake

Wednesday August 24, 2022

Final testing results confirm a microcystin level of 8.4 ug/l taken from Round Lake in Hillsdale County

Branch-Hillsdale-St. Joseph Community Health Agency has received from Michigan Department of Health and Human Services’ Bureau of Laboratories the final testing results of water samples taken from Round Lake on August 12, 2022. Final testing results confirm a microcystin level of 8.4 ug/l which is slightly higher than the Environmental Protection Agency’s recommended level of 8.0 ug/l for recreational activity.

Branch-Hillsdale-St. Joseph Community Health Agency, in consultation with Michigan Department of Health and Human Services (MDHHS), is continuing the public health advisory for a confirmed harmful algal bloom in Round Lake, Hillsdale County.

“Round Lake residents and visitors are encouraged to continue avoiding any discolored water, scums, or algal matter, including floating purple mats or clumps,” says Paul Andriacchi, Environmental Health Director. “Algal blooms can last up to several weeks and toxin levels will vary until the algae die and decompose.”

Steps you can take to avoid illness:

Algal blooms are a normal part of lake and pond cycle. Harmful algal blooms need sunlight, slow-moving water, and nutrients, like nitrogen and phosphorus. Nutrient pollution from human activities makes the problem worse, leading to more severe and more frequent blooms. You can help reduce nutrient pollution by:

Residents and visitors to water bodies are encouraged to report suspected Harmful Algal Blooms to the Environmental Assistance Center at 800-662-9278 or email AlgaeBloom@Michigan.gov. Sending photos is helpful to investigating staff.

The Branch-Hillsdale-St. Joseph Community Health Agency is committed to promoting wellness, preventing disease, providing health care, and protecting the environment.