Harmful algal blooms occur when normally occurring cyanobacteria in the water multiply quickly to form visible colonies or blooms. These blooms sometimes produce potent cyanotoxins that pose serious health risks to humans and animals.Although most algal blooms are not toxic, some types of cyanobacteria produce nerve or liver toxins. Toxicity is hard to predict in part because a single species of algae can have both toxic and non-toxic strains, and a bloom that tests nontoxic one day can be toxic the next.
Real-Time Monitoring Networks
Check 2019 Monitoring Updates
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.
Find Guidance Documents
Retrieve helpful guidance documents and response plans. For agencies responding to harmful algal blooms.
Signage & Handouts
Go to Response Agency Resources for more resources.
Report a Bloom
24-Hour DEQ Environment Incidents Line: (801) 536-4123
Call Utah Poison Control Center
If you believe you or your pet have been exposed to a harmful algal bloom, call (800) 222-1222.
|Location||Last Sample Date||Advisory Level|
|Calder Reservoir||July 2, 2019||Warning|
|Matt Warner Reservoir||July 2, 2019||Warning|
|Payson Lakes||June 24, 2019||Warning for McClellen Lake|
|Utah Lake||July 10, 2019||Warning|
2019 Monitoring Updates
|Location||Last Sample Date|
Get BloomWatch App
Help us track cyanobacteria blooms with your smartphone. Go to cyanos.org for more info.