Algae Alert: These Minnesota Lakes Now Unsafe to Swim

Minnesota may be the Land of 10,000 Lakes, but right now, only around 9,990 are fit to swim in after warnings were issued for algae outbreaks on nearly a dozen bodies of water across the state.

The hot, humid summer weather that's been prevalent across the North Star State this July might make you want to take a dip in one of our 10,000 lakes to cool off, right? But local officials in these Minnesota cities are urging you to avoid any contact with these lakes that are now deemed unsafe.

Swimming, kayaking, paddleboarding, and more on Minnesota's usually pristine lakes, rivers, creeks, and other waterways is often a good way to get some enjoyment on a warm summer day. But not always!

SEE ALSO: Here Are the Most Snake-Infested Lakes in MN in 2025

Thanks to a recent outbreak of blue-green algae, you'll likely want to stay out of these waters completely. Even though most algae are normally present in bodies of water and are common in Minnesota, this type isn't fun. The Minnesota Pollution Control Agency explains more:

When temperatures climb and the summer sun beats down, conditions are ripe for Minnesota lakes to produce harmful algae blooms, some of which can be harmful to pets and humans. Though often referred to as algae, blue-green algae are not algae at all, but types of bacteria called cyanobacteria. When conditions are right, these bacteria “blooms” that can produce toxins that are linked to illness in humans and animals.

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So if you were looking to head out and hit the water on one of these Minnesota lakes, you'll likely want to think again. Here's where current outbreaks of blue-green algae have been reported in the Bold North:

• Carver County posted an alert earlier in July that noted county staff 'suspected blue-green algae blooms in several lakes, including Bavaria, Eagle, Hydes, Parley, Reitz, Swede, Waconia, and Wasserman.'
• KSTP-TV in the Twin Cities reported on July 24th that the Minneapolis Park and Recreation Board (MPRB) sent out a warning for both the Lake Nokomis Main Beach and Lake Nokomis 50th Street Beach after discovering blue-green algae toxins in the water.

• The North Oaks Homeowners Association reported a blue-green algae outbreak on Pleasant Lake earlier this month. In an updated alert dated July 14, 2025, the association noted that the 'sand area at the beach remains open, and members are welcome to use canoes, kayaks, and paddleboards. Please note that swimming is permitted at your own risk, and water should not be ingested until further notice,' the alert said.
• And in an alert dated June 19, 2025, the Nine Mile Creek Watershed District reported that 'the public should avoid contact with the water in North and South Lake Cornelia in Edina,' due to the water containing blue-green algae cyanotoxins at levels that 'may cause harm.'

Before you head out to your favorite spot, you're advised to check with local authorities or the Minnesota Pollution Control Agency (MPCA) to check if there are any current advisories in place. For more information on harmful algae blooms, you can call the MPCA at 651-757-2822 or 800-657-3864.

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