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 2018 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.
|Location||Last Sample Date||Advisory Level|
2018 Monitoring Updates
|Location||Last Sample Date|
|Bear River||August 1, 2018|
|Big Lake||July 19, 2018|
|Calder Reservoir||August 30, 2018|
|Deer Creek Reservoir||October 18, 2018|
|East Canyon Reservoir||September 10, 2018|
|Echo Reservoir||September 17, 2018|
|Gunlock Reservoir||August 8, 2018|
|Hoop Lake||August 8, 2018|
|Jordan River and Canals||September 11, 2018|
|Jordanelle Reservoir||September 11, 2018|
|Manning Meadow Reservoir||August 7, 2018|
|Mantua Reservoir||July 19, 2018|
|Matt Warner Reservoir||October 4, 2018|
|Mill Meadow Reservoir||October 17, 2018|
|Montes Creek Reservoir||August 29, 2018|
|Otter Creek||September 24, 2018|
|Panguitch Lake||October 31, 2018|
|Payson Lakes||September 6, 2018|
|Pineview Reservoir||September 10, 2018|
|Rockport Reservoir||June 20, 2018|
|Salina Reservoir||October 3, 2018|
|Scofield Reservoir||October 30, 2018|
|Utah Lake||October 22, 2018|
|Upper & Lower Box Creek Reservoirs||July 16, 2018|
|Upper Kents Lake||August 9, 2018|
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.
Get BloomWatch App
Help us track cyanobacteria blooms with your smartphone. Go to cyanos.org for more info.