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Treating Water in the Backcountry FAQs

Will my filter remove cyanotoxins from water?

No. There is no known recreational water filtration method that is effective at removing cyanotoxins. Do not drink water from a water body with a suspected or posted harmful algal bloom.

Can boiling water or other treatments remove cyanotoxins?

No. Treatments such as boiling, disinfecting water with chlorine, or water filtration units do not remove cyanotoxins. Do not drink water from a water body with a suspected or posted harmful algal bloom.

What about using water with a HAB for washing?

If a harmful algal bloom (HAB) is visible or indicated, find a better source of water for washing food, dishes, and clothes. Avoid bathing or showering in water containing algae, as skin contact may lead to irritation or other adverse health effects.

Where can I learn more about choosing and treating water in the backcountry?

Water from a HAB-free source should still be treated to reduce the risk of exposure to harmful waterborne pathogens. Learn about the effectiveness of different types of treatments and where to gather water.


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