Update September 14, 2018
The Division of Water Quality (DWQ) visited Hoop Lake on August 31, 2018, and collected data at three sites around the lake. The crew observed green streaks/sheen on the surface of the water near the southwestern shore near the boat launch. DWQ took surface samples at the boat launch. While the northwestern shore and east shore displayed isolated instances of cyanobacteria, the crew didn’t observe the same green streaks as were found at the southwest boat launch.
Toxin strip tests were non-detect for microcystin. The anatoxin-a strip test had an invalid control line. Further analysis by the Utah Department of Agriculture (UDAF) lab showed the sample was non-detect for the anatoxin-a.
Cyanobacteria cell-count concentrations, however, were high: 93,737 cells per milliliter (cells/ml), which exceeds the recreation health-based threshold for a Warning Advisory.