MINNEAPOLIS (WCCO) — There’s a warning out for beach-goers to beware of blue-green algae.

Some types of the algae are very toxic, even deadly, to people and especially pets. The most recent warning is for Carver Lake in Woodbury.

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The Ramsey Washington Watershed District confirmed there are blue-green blooms there.

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The bright green algae looks like a splash of paint and it sits on the top of lake water.

There’s no way to predict if a bloom is toxic, but officials say it’s best to avoid contact with the water.

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If you think you or your pet has ingested water infected with the blue-green algae, get medical attention immediately.