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Reposted from the Utah Dept of Environmental Quality, October 20, 2014

LINDON, UTAH (October 20, 2014) -- Results from water samples collected at Utah Lake on October 10, 2014, show that while concentrations of microcystins had dropped in most locations, samples taken from the Lindon Harbor shoreline on October 10th showed a value of 730 micrograms per liter (ug/L) for microcystins .

The level of microcystins found along the shoreline -- almost 70 times the health advisory level -- has a high probability of producing acute health effects during recreational exposure according to health-based guidelines established by the Environmental Protection Agency (EPA) and World Health Organization (WHO).

These data highlight how variable toxin concentrations can be within a small area. Earlier sampling results were more broadly representative of microcystin levels within the harbor area, and other samples taken on October 10, 2014, showed that the concentrations of microcystins had dipped below levels that could trigger a public health advisory. The sampling results from the shoreline, however, suggest that earlier data may not have been representative of the water that was ingested by the dog.

A public health advisory remains in effect for Utah Lake, and the Utah County Health Department recommends that people and animals refrain from swimming or ingesting water in areas with algal blooms to avoid exposure to possible toxins.

Public Health Advisory

Previous releases:
October 7, Cyanobacteria Bloom Warning for Utah Lake
October 9, Utah Lake Test Results Confirm Presence of Toxin
October 14, Ongoing Testing -- Algae strongly suspected in dog's death

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Utah Department of Environmental Quality