KLAMATH COUNTY, Ore. — The Oregon Health Authority (OHA) has issued a recreational use health advisory for the Upper Klamath National Wildlife Refuge after testing detected cyanotoxins at levels exceeding recreational safety guidelines.
The advisory warns visitors to avoid swimming and high-speed water activities, including water skiing and power boating, in areas where harmful algal blooms are visible. Health officials say the primary risk comes from ingesting or inhaling contaminated water droplets, rather than skin contact. However, individuals with sensitive skin may experience irritation or develop a red, puffy rash after exposure.
Despite the advisory, OHA said many recreational activities remain safe. Fishing, bird watching, canoeing and low-speed boating are still encouraged, provided watercraft do not create excessive spray that could increase the risk of inhaling toxins.
Drinking Water Concerns
Health officials emphasized that drinking untreated water directly from bloom-affected areas is especially dangerous. Cyanotoxins cannot be removed by boiling water or using standard camping-style filters and water treatment methods.
Residents who draw household water directly from affected portions of the refuge are advised to use an alternative source for drinking and cooking. OHA noted that not all private water treatment systems are capable of removing harmful cyanotoxins.
Visitors with questions about water availability at nearby campgrounds or day-use areas are encouraged to contact campground management or local health authorities.
Health Risks for People and Pets
Children and pets face a higher risk of exposure because of their size, activity levels and greater likelihood of swallowing contaminated water.
Exposure to cyanotoxins can cause symptoms ranging from stomach cramps, diarrhea, nausea and vomiting to more severe reactions such as numbness, tingling, dizziness and shortness of breath. Serious symptoms may require medical attention.
Dogs are particularly vulnerable and can become severely ill or die within minutes to hours after exposure. Pets may be poisoned by drinking contaminated water, licking algae-contaminated fur, or consuming floating mats or dried algae deposits along shorelines.
Symptoms in dogs may include difficulty walking, seizures, lethargy and loss of appetite. OHA urges pet owners to keep dogs on leashes and away from affected water and algal material. Immediate veterinary care is recommended if symptoms develop.
Fishing Advisory
OHA also cautioned that fish caught in waters affected by cyanobacterial blooms may present unknown health risks. The agency recommends avoiding consumption of fish from impacted areas.
For those who choose to eat fish caught in bloom-affected waters, officials advise removing the skin, fat and internal organs before cooking or freezing, as toxins are more likely to accumulate in those tissues. Fish fillets should also be thoroughly rinsed with clean water.
Anyone seeking additional health information or wishing to report a possible illness related to cyanotoxin exposure can contact OHA at 971-673-0482 or visit the agency’s harmful algae bloom information resources.
The advisory will remain in effect until toxin levels decline and health officials determine conditions are safe for full recreational use.
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