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Oregon health officials caution public about potentially harmful algae blooms

The warning extends to dogs that can become sick by licking water from their fur.
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Cyanobacteria blooms
Cyanobacteria blooms may look like mats floating in the water, or stuck on the bottom, or on the shore. | OREGON HEALTH AUTHORITY
June 3, 2025

The Oregon Health Authority is cautioning people to watch out for algae blooms when visiting bodies of water this summer.

Algae blooms can multiply in water during warm weather.. Although algae blooms can be harmless, some produce cyanotoxins, a harmful bacteria that can make people and animals sick. Cyanotoxins are especially dangerous for children, pets, and livestock.

The agency said people should avoid water areas that are foamy, scummy or thick like paint. They should also be on the lookout for water that is pea-green or blue-green, and has floating bright green clumps. Thick green or brownish-red mats on the shore should also be avoided.

Exposure to the toxins can happen when water is swallowed while swimming or water droplets are inhaled during water-skiing or wakeboarding. Dogs can be exposed when licking their fur or by eating the toxic mats on the shore.

Linda Novitski, a recreational water specialist for OHA, says it is also important to identify exposure symptoms.

“Those can include diarrhea, nausea, dizziness, and if you or your pet start to develop symptoms like this, it's important to seek medical attention right away,” said Novitski.

People can also check the OHA website for cyanobacteria alerts in their area. OHA will also take measures beforehand by releasing public warnings in case there are reports of dog illness or death from cyanotoxin exposure.


This article was originally published by KLCC. It has been republished here with permission.

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