Kents Lake Algal Bloom Monitoring 2019

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Update November 12, 2019

Kents Lake, October 23, 2019

The Southwest Utah Public Health Department (SUPHD) has removed the Warning Advisory for Kents Lake. Toxin test results from the Utah Public Health Lab (UPHL) for samples collected by the Division of Water Quality (DWQ) on October 23, 2019, at the access point at Kents Lake exceeded the recreation health-based threshold for a Warning Advisory for anatoxin-a. Microcystin levels were well below the advisory threshold.

The HABs monitoring season ended on October 31, 2019. The Utah Department of Health and local health departments have determined that the health risk from HABs from primary contact recreation drops with the onset of colder temperatures.

The close of the monitoring season and removal of advisories doesn’t mean HABs are no longer present. HABs can persist throughout the fall and winter and can pose a potential threat to humans and pets. It’s important to recognize the signs of a bloom and take appropriate precautions. Recreators are advised to stay out of the water and avoid any contact with water or scum if they suspect a harmful algal bloom. Hunters and fishers should clean waterfowl and fish well and discard all guts.

Data Summary

Access

  • Sample date: October 23, 2019
  • Sample Type: Elbow-depth integrated composite sample
  • Microcystin: <2.0 micrograms per liter (µg/L)
  • Anatoxin-a: 0.11 µg/L

Update October 28, 2019

Kents Lake, October 9, 2019

Toxin test results received from the Utah Public Health Lab (UPHL) for samples collected by the Division of Water Quality (DWQ) at Kents Lake on October 9, 2019, showed anatoxin-a and microcystin levels well below the recreation health-based threshold for a Warning Advisory. Cyanobacteria cell-count concentration results are pending from PhycoTech.

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.

Kents Lake remains under a Warning Advisory.

Data Summary

  • Sample date: October 9, 2019
  • Sample type: Elbow-depth integrated composite sample
  • Microcystin: <2.0 micrograms per liter (µg/L)
  • Anatoxin-a: <0.10 µg/L

Update September 23, 2019

The Southwest Utah Public Health Department has issued a Warning Advisory for Kents Lake after sampling conducted by the Division of Water Quality (DWQ) on September 10, 2019, showed anatoxin-a levels above the recreation health-based threshold for a Warning Advisory.

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.


Update September 17, 2019

Kents Lake, September 10, 2019

Toxin test results received from the Utah Public Health Lab (UPHL) for samples collected by the Division of Water Quality (DWQ) at the access point on Kents Lake 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 below the advisory threshold. The primary taxon in the samples was Dolichospermum, a known toxin-producer.

The DWQ monitoring crew observed visible cyanobacteria that resembled grass clippings. The cyanobacteria were consistent throughout the water column and clumped together in places.

Data Summary

Elbow-depth integrated composite sample

  • Sample date: September 10, 2019
  • Microcystin: 0.2 micrograms per liter (µg/L)
  • Anatoxin-a: 0.15 µg/L
  • Cyanobacteria cell-counts: 10,846 cells per milliliter (cells/mL)