COVID-19: In an effort to reduce the spread of COVID-19, The Utah Department of Environmental Quality is limiting person-to-person contact and will close our offices to the public starting on April 3. Please contact DEQ here to conduct business.

Gunlock Reservoir Algal Bloom Monitoring 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.

Gunlock Reservoir is located 15 miles northwest of St. George. The reservoir was originally constructed for irrigation and flood control, but it is also a popular boating, water sports, and fishing destination.

Update August 14, 2018

The Division of Water Quality (DWQ) visited Gunlock Reservoir on August 8, 2019. The monitoring crew noticed a small bloom along the shore near the boat launch on the southeast end of the reservoir. The crew collected surface samples at this location. Toxin strip results were non-detect for both anatoxin-a and microcystin.