Olmsted County Public Health and the Rochester Parks and Recreation departments have issued a health advisory for Rochester's Foster Arends beach.
The advisory warns of a "possible blue-green algae bloom and the presence of bacteria called cyanobacteria" in the pond at Foster Arends Park in Northeast Rochester.
According to the warning, blue-green algae blooms can make humans and animals sick. Pets, especially dogs, are susceptible to harmful algae.
Any person or pet who has gone into the water at Foster Arends water is advised to wash off with fresh water immediately.
Animals reportedly can experience symptoms within minutes of exposure.
The health risk to humans swimming in the lake is low. The advisory will be removed when bacteria levels have returned to normal.