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Oregon Health officials urge public to check for harmful algal blooms when visiting rivers, lakes and beaches

Water's edge is matted with a cyanobacteria bloom.
Oregon Health Authority
FILE: Cyanobacteria blooms may look like mats floating in the water, or stuck on the bottom, or on the shore.

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.

Sajina Shrestha joined the KLCC news team in 2025. She is the KLCC Public Radio Foundation Journalism Fellow. She has a masters in Journalism from the Newmark Graduate School of Journalism, CUNY, where she studied audio and data journalism. She previously interned at Connecticut Public and Milk Street Radio. In her free time, Sajina enjoys painting and analyzing data in Python.
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