Piute Reservoir Algal Bloom Monitoring 2019

Warning Advisory

  • Do not swim or water ski in this area.
  • Avoid areas of algae scum when boating.
  • Keep animals away.
  • Do not ingest the water.
  • Clean fish well and discard guts.

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.

Visit the 2019 Photo Gallery

Get BloomWatch App

Help us track cyanobacteria blooms with your smartphone. Go to cyanos.org for more info.

Update September 16, 2019

Piute Reservoir. September 10, 2019

The Central Utah Public Health Department (CUPHD) issued a Warning Advisory for Piute Reservoir on September 16, 2019.

Toxin test results received from the Utah Public Health Lab (UPHL) for samples collected by the Division of Water Quality (DWQ) at the Boat Ramp at Piute Reservoir on September 10, 2019, showed anatoxin-a levels exceeding the recreation health-based threshold for a Warning Advisory. Microcystin levels and cyanobacteria cell-count concentrations were well below the advisory threshold. Aphanizomenon was the primary taxon in the samples.

The DWQ monitoring crew observed visible cyanobacteria that resembled grass clippings in the reservoir. The cyanobacteria were consistent throughout the water column.

A Warning Advisory indicates a moderate relative probability of acute health risk, cell-count density of 20,000 – 10 million cells per milliliter (cells/ml), microcystin levels of 4-2,000 micrograms per liter (µg/L), or anatoxin-a levels above non-detect.

Data Summary

  • Sample type: Elbow-depth integrated composite sample
  • Sample date: September 10, 2019
  • Microcystin: <2.0 micrograms per liter (µg/L)
  • Anatoxin-a: 0.15 µg/L
  • Cyanobacteria cell counts: 1,660 cells per milliliter (cells/mL)