EPA has released a suite of materials states and communities can use to protect public health during harmful algal bloom (HAB) outbreaks caused by cyanobacteria. Some blooms are capable of producing toxins, called cyanotoxins, which can harm humans and animals, affect drinking water sources and impact local economies. Public health officials and outdoor water recreational managers can use EPA’s online resources to develop a cyanotoxin monitoring program, communicate potential health risks to the public, and address HAB outbreaks.