As summer approaches, Oregon Health Authority (OHA) reminds people heading outdoors to enjoy our lakes, rivers and reservoirs to be on the look-out for potentially toxic cyanobacteria blooms. These beneficial bacteria are found in all fresh water worldwide, but under the right conditions—warm weather, sunlight, water temperature, nutrients and water chemistry—they can multiply into blooms. Many blooms are harmless, but some produce cyanotoxins that make people and animals sick.
Exposure to cyanotoxins occurs when water is swallowed while swimming or when people inhale water droplets during high-speed activities such as water skiing or wakeboarding. Symptoms of exposure to cyanotoxins include diarrhea, cramps, vomiting, numbness, dizziness and fainting.
Although cyanotoxins are not absorbed through the skin, people with sensitive skin can develop a red, raised rash when wading, playing or swimming in or around a bloom.
Children and pets are particularly sensitive to illness because of their size and activity levels. Similarly, livestock and wildlife can become ill and die after drinking from water bodies, troughs or other sources of drinking water affected by blooms and potential toxins.
Dogs can get extremely ill and even die within minutes to hours of exposure to cyanotoxins by drinking the water, licking their fur or eating the toxins from floating mats or dried crust along the shore. It is very important to get a pet to a veterinarian as soon as possible if they exhibit symptoms, including diarrhea, vomiting, breathing problems, difficulty walking or standing or loss of appetite.
Very few freshwater bodies in Oregon are monitored for cyanotoxins. For this reason, it is important for people to carefully observe any water body they choose to recreate in before taking the plunge.
OHA recommends that everyone stay out of water that looks foamy, scummy, thick like pea-green or blue-green paint or where brownish-red mats are present. Additionally, since blooms can wash up on the shore, people should avoid areas with algal mats that are either attached, floating or stranded on the shore.
Even then, looks can be deceiving. Certain blooms grow on or near the bottom of water bodies such as lakes and rivers. While some blooms make and release toxins into the water, they don’t change how the surface of the water looks, making them hard to see. For visual examples of algae blooms, visit OHA’s Algae Bloom Photo Gallery at bit.ly/3yeS9s8.
Open recreational areas where blooms are identified can still be enjoyed for activities such as camping, hiking, biking, picnicking and bird watching. By being aware of signs of a bloom and taking appropriate precautions to reduce or eliminate exposure, people can still enjoy water activities such as canoeing, boating and fishing as long as boat speeds do not create excessive water spray and fish are cleaned appropriately.