The Virgin River has since tested positive for a toxin produced by cyanobacteria. The Southwest Utah Public Health Department has issued a warning for certain parts of the North Fork of the Virgin River. Warning signs will be posted to avoid swimming in or contact with the affected area of the river. Visitors are currently advised to not drink the water, keep pets out of the water, avoid areas with algae scum and to thoroughly clean fish if you plan to eat them. Please stay super alert if you gonna be in Zion with your pet.