Oregon Health Authority Warns of Toxic Cyanobacteria Blooms as Dogs Face Illness and Death in State’s Lakes and Rivers

Because of the health risks of the potentially toxic cyanobacteria blooms in Oregon’s lakes, rivers, and reservoirs, the Oregon Health Authority (OHA) urged residents and visitors to be vigilant and report the possible presence of cyanobacteria in freshwater bodies across Oregon.

The Agency has also made an online map available to see where cyanobacteria blooms have been reported.

Cyanobacteria Blooms Warning In Oregon

Effective immediately, the OHO is issuing pre-emptive public warnings following reports of dog illnesses or deaths potentially linked to cyanotoxin exposure and has introduced a new tool to report the possible presence of cyanobacteria in freshwater bodies across Oregon.

Dogs are especially vulnerable to cyanobacteria and can become severely ill or die within minutes to hours after exposure by drinking contaminated water or ingesting toxins from floating mats.

Cyanobacteria is a beneficial bacteria found in all freshwater globally. However, it can multiply into blooms in warm weather under sunlight and specific water chemistry conditions.

Although most blooms are harmless, some produce cyanotoxins that can make humans and animals ill. You could be exposed to cyanotoxins when water or algae mat material is swallowed or when water droplets are inhaled during activities like water skiing.

You can watch the Interstate Technology and Regulatory Council’s (ITRC) YouTube video here:

Although cyanotoxins are not absorbed through the skin, people with sensitive skin could develop a rash after being in contact with blooms. Cyanotoxin exposure symptoms include diarrhea, cramps, vomiting, numbness, dizziness, and fainting.

Cyanotoxin symptoms in dogs include diarrhea, vomiting, breathing difficulties, and loss of appetite. Pet owners should seek veterinary care immediately if their dog shows these signs after swimming.

Cyanotoxins can still be present in clear water even after a bloom has dissipated, posing ongoing risks. The OHA advised visitors to water bodies to remain alert for signs of cyanobacteria blooms, which can develop and disappear rapidly under favorable conditions.

Oregon Cyanotoxin Useful Information

• Click here for a map and table of current recreational use health advisories for cyanobacteria and cyanotoxins
• Contact OHA at 971-673-0440 for health information or to report an illness
• Visit OHA’s Cyanobacteria (Harmful Algae) Blooms website.