Updated June 7, 2022
Zion National Park continues to monitor monthly for the presence of harmful cyanobacteria and cyanotoxins. Zion staff take a “multiple lines of evidence” approach when using data to issue recreational advisories. Monitoring efforts have detected cyanotoxins harmful to humans and pets in the North Fork of the Virgin River, therefore, the North Fork of the Virgin River and all connected tributaries will be elevated to a Warning Advisory. A Health Watch remains in effect at La Verkin Creek and a Warning Advisory remains in effect at North Creek. During Warning and Health Watch advisories, recreators should avoid primary contact recreation such as swimming or submerging the head. Do not drink stream water anywhere in the park. Carry in water or filter directly from a spring source.
Need to know about cyanobacteria
Children are especially vulnerable to cyanotoxins, so be mindful of where they go if you are near a body of water like the Virgin River.
Learn more about toxic cyanobacteria from:
Last updated: June 7, 2022