Harmful Algal Blooms Home

The Division of Water Quality will resume monitoring for harmful algal blooms and waterborne pathogens in summer 2022. HABs may still be present in Utah’s water bodies during the fall, winter, and spring. If you recreate during this time, avoid areas of scum, know what to look for, and learn how to protect yourself and your family, including pets.

Please Note: This map provides current data on harmful algal blooms AND waterborne pathogens. DWQ does not monitor all the sites on the map for both types of contaminants.

Monitoring
Locations

Health
Watch

Advisory
Warning

Danger
Warning

Harmful algal blooms (HABs) develop when naturally occurring cyanobacteria in the water multiply very quickly to form green or blue-green water, scum, or mats. These blooms can produce potent cyanotoxins that pose serious health risks to humans, pets, and livestock.