In August 2014, residents of Toledo lost the use of tap water for two days because of a toxic algal bloom in the western basin of Lake Erie, which is their water source. In subsequent summers, the lake’s algal blooms have been smaller, but they remain a persistent phenomenon. In fact, the National Oceanic and Atmospheric Administration (NOAA) is predicting a significant cyanobacteria algal bloom in western Lake Erie this summer.
Numerous definitions of “harmful algal blooms” exist, but they generally can be understood as excessive growths of various species of phytoplankton, protists, cyanobacteria, or macro and benthic algae that negatively impact water quality, aquatic ecosystem stability, or animal and human health. The blooms may be toxic or nontoxic. Even nontoxic blooms can have repercussions for drinking water treatment, recreational use of the waterbody, and the overall economy.