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Preliminary tests have shown no detectable level of toxins in Herriman's Blackridge Reservoir, but officials are waiting for further test results before re-opening the popular lake.

A potentially toxic algae bloom shut down the reservoir Aug. 6. City officials found several species of algae turning expanses of the water green and began testing the water to determine the health risks.

Though early tests did not detect toxins, the Utah Department of Health wants to test the water further, said city spokeswoman Tami Moody on Friday evening.

In the meantime, the city is treating the water and plans to replace the aerators. City officials believe malfunctioning aerator equipment may have created conditions that accelerated the algae growth.

Twitter: @MikeyPanda