Lake Mead officials lifted the no-swim advisory Wednesday after no toxin producers were found in the water, according to the National Park Service.
An advisory was issued June 8 at the Overton Arm after a foamy substance and 25 dead carp were found in a northern part of the lake.
It’s unknown whether the foam contributed to the death of the fish, according to the park service.
The Southern Nevada Water Authority, Nevada Department of Wildlife and the Nevada Division of Environmental Protection teamed with the National Park Service to test the lake’s water.
They found the foam was mostly made up of proteins released from dead freshwater algae. Tests found that water samples from the area were all within the usual values for temperature and dissolved oxygen levels.
According to park spokesperson Christie Vanover, the foam seems to be dissipating, and no additional dead fish have been found.
“While we haven’t received anything definitive as to the cause, we have reasonably evaluated the situation,” Vanover said. “Through all the scientific investigation, nothing dangerous to humans has been found.”
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