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Posted on: July 23, 2021

Watershed District Issues Advisory for Mirror Lake

Edina, Minn., July 22, 2021 - The public should avoid contact with the water in Mirror Lake. The water contains blue-green algae at levels that may cause short-term harm including skin irritation and gastrointestinal problems. People and pets should avoid all contact with the water, scum or algae.

Analyses of water samples that the Nine Mile Creek Watershed District took from Mirror Lake on July 15 indicate blue-green algae numbers that exceed the World Health Organization (WHO) threshold for low probability of adverse health risks from algal toxins. WHO provides threshold guidance for the probability of adverse health risks related to blue-green algal counts for “little, if any,” “low,” “moderate,” or “high” probabilities of adverse health risks for people or pets.

Blue-green algae on Mirror Lake are a concern because this type of algae can produce algal toxins, which can pose a health threat for pets and people when concentrations become high enough. Algal toxin testing has not occurred on this lake. The Nine Mile Creek Watershed District will collect another sample from the lake and will release updated information when it is available following the sampling event.

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