Even casual observers of Great Lakes issues are aware of the problems associated with algal blooms.
Perhaps they remember the headlines from August 2014 when Toledo went without drinking water for three days due to the threat of toxic blooms contaminating the city’s water supply. Or a day their favorite beach posted “No Swimming” signs because of toxic algal bloom threats.
Great Lakes Now
https://www.greatlakesnow.org/2020/11/small-streams-impact-great-lakes-water-quality/