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.
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.
How To Stay Safe
- Don’t swallow water when swimming.
- Wash hands with clean water before eating or preparing food.
- Clean fish well and discard the guts.
- Keep animals away.
- Recognize the signs of a bloom, and when in doubt, stay out.
Visit HABs Photo Gallery
See examples of HABs in Utah in the photo gallery.
Learn about health risks to people and pets exposed to algal blooms and what you can do to recreate safely.
Learn About HABs
Got questions? Find more info about harmful algal blooms.