If the bloom continues to spread northward, it may reach the Jordan River in coming days, said a news release from the Utah Department of Environmental Quality.
Water quality tests outside Provo Bay are pending to determine the risk to public health.
The most recent test results indicate that the toxin microcystin is present, but at levels well below the Environmental Protection Agency’s health-based threshold for recreational waters.
High levels of nutrients in the water, combined with warm temperatures, abundant sunlight, and calm water, can promote growth, resulting in extensive blooms.
These blooms consist of cyanobacteria, often referred to as blue-green algae, a type of bacteria that poses risks to humans, wildlife, domestic animals and fish.