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Boulder warns residents to watch for potentially toxic blue-green algae

Daily Camera - 5/24/2024

May 24—As temperatures get warmer, Boulder officials warn residents to avoid ponds and lakes if they see blue-green algae, since it can produce toxins harmful to people and pets, according to a press release.

The blue-green algae contains cyanobacteria, which can produce the toxins, according to the release. It looks like thick pea soup, spilled bluish-green paint on the water's surface or a thick mat of foam along the shoreline, the release said. The vast majority of algae in ponds and lakes during summer months is not toxic, the release said.

Boulder workers do not test park and open space water for cyanobacteria because the production of the toxins is variable, with harmful toxins detectable at one time but not detectable hours later, according to the release.

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