CHESHIRE TOWNSHIP, Mich. (WOOD) — Health officials are warning about harmful blue-green algae blooms that may be in Swan Lake in Allegan County.

There have been “preliminary positive results from testing” for potential blue-green algae bloom, the Allegan County Health Department said in a Wednesday release. It said the Michigan Department of Environment, Great Lakes, and Energy and the Michigan Department of Health and Human Services will be sent samples for more testing.

Blue-green algae bloom, also known as cyanobacteria or harmful algal blooms, can cause health issues for people and pets.

People should avoid water-related activities at Swan Lake in the area where the bloom can be seen, the health department said. Pet owners should keep their pets from drinking the water or going into the lake.

Contact your doctor or veterinarian and shower if you or your pet are exposed to blue-green algae bloom or have swallowed some of the water. If you start to have symptoms, call your doctor or Poison Control at 800.222.1222.

Harmful algal blooms were found at Swan Lake in the summer of 2021.