SPRINGDALE, Utah — Zion National Park is closely monitoring streams and the Virgin River for toxic cyanobacteria blooms that have prompted warnings across key recreational areas.
The Utah Department of Environmental Quality (DEQ) has issued warning advisories for the North Fork of the Virgin River and its tributary, North Creek, due to the presence of harmful cyanobacteria. These areas include some of the park’s most visited attractions, such as The Narrows and Emerald Pools.
La Verkin Creek, another waterway in the park, has been placed under a health watch. While this is not an official advisory, the DEQ notes it signals the potential for harmful blooms and justifies increased monitoring efforts.
Exposure to cyanobacteria-contaminated water—through swimming or drinking—can cause serious health complications. Symptoms may include respiratory distress, neurological issues, liver and kidney damage. The National Park Service (NPS) strongly advises against drinking any stream water within the park, even in areas not currently under advisory.
Potable Water Access and Safe Practices
Visitors are urged to bring their own water supply or use water only from designated potable sources within the park. Safe locations for drinking water include:
- Zion Canyon Visitor Center
- South and Watchman Campgrounds
- Zion Human History Museum
- Zion Lodge
- The Grotto
- Temple of Sinawava
Several natural springs are considered safe only after proper disinfection. These include:
- Beatty Spring (Kolob Canyons)
- Wildcat Spring (Wildcat Canyon)
- Sawmill Springs, Potato Hollow Spring, and West Rim Cabin Spring (West Rim)
- Stave Spring (East Rim)
- Coalpits Wash Spring (Southwest Desert)
Water from Hop Valley is not considered safe due to potential contamination from nearby cattle operations.
To ensure safety, the NPS recommends boiling water for at least three minutes or using purification methods approved by the Environmental Protection Agency. These include iodine tablets, appropriate bleach solutions, or backpacking-grade water filters. However, the NPS emphasizes that no filtration or disinfection method is currently known to effectively remove cyanobacteria or its toxins.
Health and Safety Warnings
Visitors who suspect exposure to cyanobacteria should watch for symptoms such as skin irritation, headaches, numbness, incoherent speech, seizures, vomiting, or diarrhea. Immediate medical attention is advised, along with contacting Utah Poison Control at (800) 222-1222.
Pets are also at risk. Warning signs of exposure in animals include drooling, lethargy, tremors, vomiting, and paralysis. Owners are urged to seek veterinary care without delay.
While it remains uncertain whether cyanobacteria can infect open wounds, the National Park Service advises all park visitors to make informed decisions while engaging in recreational activities.
