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Reports of Blue-Green Algae in Dryden, Kenora lakes

Health authorities advise the public to treat reported blooms on Laurenson, Thunder lakes as if they are cyanobacteria until testing results returned
Blue green algae
Blue-green algae formed in a lake (via Shutterstock)

KENORA, Ont. – The Northwestern Health Unit is warning residents about reported blue-green algae blooms on two northwestern Ontario lakes.

The health unit is now testing water from Laurenson Lake, in Kenora, and Thunder Lake, just outside of Dryden.

Until results are known, public health authorities advise the public to treat the blooms as though they are blue-green algae, or cyanobacteria, which can pose health risks to people and animals.

The bacteria is normally not visible in water, but under favourable conditions – such as warm, shallow, slow-moving waters, and the presence of nutrients such as nitrogen and phosphorous – it can rapidly multiply to form a large mass in the water, called a bloom.

The blooms can make the water appear like green pea soup or turquoise paint.

“If you suspect a blue-green algal bloom, be cautious and assume that toxins are present,” the health unit said in a release. “Do not drink the water and avoid swimming or household use.”

If contact does occur, the health unit advises washing with soap and water or rinsing thoroughly with clean water. Water not visibly affected by a blue-green algae bloom rarely causes health effects for swimming and household contact such as bathing or showering, they add, though some people may be sensitive.

Residents who spot a bloom are asked to report it by calling 1-800-268-6060. The Northwestern Health Unit can also be contacted with questions at (807) 468-3147.




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