Big Sand Wash Reservoir Recreational Monitoring 2021

Report a Bloom

24-Hour DEQ Environment Incidents Line: (801) 536-4123

Call Utah Poison Control Center

Poison Control (800) 222-1222

If you believe you or your pet have been exposed to a harmful algal bloom, call (800) 222-1222.

Update October 18, 2021 (HABs)

On October 4th, the DWQ HABs monitoring team visited Big Sand Wash Reservoir. Harmful algal blooms were observed and cyanotoxin and cell density samples were collected. Results were returned on October 6th. The sample contained a toxigenic cell density of 106,141 cells/mL of Aphanizomenon, a known toxin producer, which is above the UDWQ/UDOH recommended Warning Advisory threshold of 100,000 cells/mL. DWQ will continue to watch the reservoir closely.


Update September 28, 2021 (Waterborne Pathogens)

On September 8th, the Tri-County Health Department visited Big Sand Wash Reservoir. Samples from near the boat ramp did not contain E. coli above recreational thresholds. Routine sampling will continue monthly.


Update August 12, 2021 (Waterborne Pathogens)

On August 11th, Tri-County Health Department visited Big Sand Wash Reservoir. Samples from near the boat ramp did not contain E. coli above recreational thresholds. Routine sampling will continue monthly.


Update July 1, 2021 (Waterborne Pathogens)

On June 21st, Tri-County Health Department visited Big Sand Wash Reservoir. Samples from near the boat ramp did not contain E. coli above recreational thresholds. Routine sampling will continue monthly.


Update June 2, 2021

The Division of Water Quality and the Utah Department of Health began monitoring for waterborne pathogens on June 1st, 2021. As UDWQ and UDOH continue to visit and monitor waterbodies, updates will be posted.