Lake Minnetonka Conservation District

Aquatic Invasive Species

 

Blue-Green Algae

Blue-green algae are not algae at all, but rather types of bacteria called cyanobacteria. Cyanobacteria thrives when there is a combination of two factors: warm weather and nutrient-dense water. Some variations of cyanobacteria produce toxins and cause cause severe illness in humans and pets.

Blue Green algae photo

Can you prevent harmful blooms?
We cannot control the weather, but we can reduce the amount of nutrients introduced into the water through run-off. Learn more about Lake-Friendly Landscaping HERE<link>.

When in Doubt, Stay Out

Because you cannot tell by looking at blue-green algae whether it is toxic or not, it is best to avoid swimming or otherwise recreating in areas with algal blooms. If you or your pet are exposed to an algal bloom, be sure sure to rinse off with fresh water immediately.

For more information about possible health effects and the risk levels of different recreational activities, visit the MN Pollution Control Agency website.

Other Common Types of Algae