Map of Algae Blooms Reported in the United States Since 2010

With peak toxic algae bloom season underway, the Environmental Working Group is releasing an updated map of all algae outbreaks reported in the United States since 2010. In coming months, the map will be updated weekly, providing comprehensive tracking of this growing nationwide hazard.

Algae blooms are an epidemic, polluting lakes and other waterways, including many used as sources for drinking water, as a 2018 EWG report revealed. They tend to thrive when water is warmer, usually from May through October, but can occur anytime, and EWG’s investigations reveal that out-of-season blooms are becoming more common.

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