MPCA predicts more new algal blooms in time for July 4 weekend

Nutrients in run-off from spring rainstorms combined with persistent hot weather on the way can mean trouble for lakes across Minnesota, triggering algal blooms that can be harmful to people and pets.

Recent reports of blooms already spotted across the state have led to swimming advisories. With temperatures just now hitting the 90s and above, the Minnesota Pollution Control Agency (MPCA) predicts that several more blooms could develop in time for the July 4 holiday weekend.

The MPCA advises people to stay out of lakes and streams if the water looks green and slimy, especially if it has a blue-green tint. The algae could contain toxic bacteria that can sicken people and kill dogs, livestock, and other animals within hours of contact. Unfortunately, you can’t tell by looking at a bloom if it is harmful or not.

“If in doubt, stay out,” says Lee Engel, surface water monitoring supervisor for the MPCA. “Excess nutrients such as phosphorus and warm water temps are ideal for growing algae and causing nuisance blooms. Holiday weekends typically see more people out on Minnesota lakes to boat, fish, and swim, and due to this year’s conditions, we need everyone to remain vigilant in looking for potentially harmful algae.”

In recent years, multiple reports of dog deaths have been attributed to exposure to toxic algae. People can protect their dogs by:

• Keeping them out of algae-laden water
• Hosing them off immediately after playing in any lake or stream
• Preventing them from ingesting affected water or licking toxins from their coat
• Seeing a veterinarian immediately if your dog may have been exposed to blue-green algae

People who come into contact with toxic blue-green algae can experience skin, throat, eye, and nose irritation and nausea.  If you come in contact with algae, rinse off with clean water afterward.