Cyanobacterial (Blue-Green Algal) Blooms: Tastes, Odors …

Blue-green algae on the Kansas River.(Public domain.) Cyanobacteria (also called blue-green algae) may produce toxins and taste-and-odor compounds that cause substantial economic and public health concerns, and are of particular interest in lakes, reservoirs, and rivers that are used for drinking-water supply.

https://www.usgs.gov/centers/kswsc/science/cyanobacterial-blue-green-algal-blooms-tastes-odors-and-toxins-0