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There is growing concern in the United States about harmful algal blooms (HABs), which occur due to rapid algal growth. HABs can cause harm to humans and their localized environment. One of the most common types of HABs, especially in freshwater, is due to cyanobacteria, a microscopic organism. HABs of cyanobacteria can produce toxins in high enough concentrations to impact human health and freshwater or marine life. Cyanobacteria toxins (cyanotoxins) can also produce taste and odor issues in drinking water, which increases the need for improved drinking-water treatment. In order to protect public health and the environment, the Department developed and commenced a HABs Monitoring Program, particularly cyanobacteria toxins, that began in 2018. These assessment reports cover the cyanotoxin work completed in each year/