Blue-green algae blooms appearing again

Blue-green algae has been seen on the Rock River and in Lake Koshkonong in Rock County. The Rock County Public Health Department has issued a warning about the health risks presented by the algae.

JANESVILLE — The Rock County Public Health Department has found blue-green algae in the Rock River and Lake Koshkonong, per a statement Tuesday.

Blue-green algae are naturally present in Wisconsin ponds, rivers and lakes and when conditions are favorable, they can grow rapidly and form blooms of bright green, blue-green or white. The algae form when there are warm temperatures combined with sunlight, and the algae can feed off nutrients in the water. The algae can form thick scum layers on the surface of the water and may look bubbly or frothy.

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