Blooms are visibly abundant proliferations of freshwater algae and have the potential to cause risks to human and animal health. Their occurrence is presently not well documented. bloomWatch! is an App that has been developed to track and document the occurrence of these potentially harmful algal blooms. Your input using this App will provide documentation as to the location and frequency of potentially harmful bloom events, helping scientists, water quality managers, and public health officials effectively track and manage the water resources that the public depends on for potable water and recreation.