Harmful Algal Bloom

Walker Lake has been placed on a HAB Warning advisory following satellite imaging of a surface bloom. The water body is expected to be unsafe for human and animal exposure. Human or animal contact with visible blooms is discouraged. Protect your pets from entering the water, drinking water, or coming in contact with scum found on the shore.

Stillwater National Wildlife Refuge has been placed on a HAB Watch Advisory after visual observations of algae having the appearance of surface cyanobacteria.

Hazardous conditions are possible or present. People and pets should use caution when in contact with water and avoid areas of algae accumulation.

Wild Horse Reservoir has been placed on a HAB Watch Advisory after visual observations of algae having the appearance of surface cyanobacteria.

Hazardous conditions are possible or present. People and pets should use caution when in contact with water and avoid areas of algae accumulation.

Rye Patch Reservoir has been placed on a HAB Watch Advisory after visual observations of algae having the appearance of surface cyanobacteria.

Hazardous conditions are possible or present. People and pets should use caution when in contact with water and avoid areas of algae accumulation.

Placer Cove, Eagle Wash Cove, and Cottonwood Cove on Lake Mohave have been placed on HAB Danger Advisory after water tests showed high Microcystin levels above the safety threshold.

Stay out of the water in the above areas! Human or animal contact with water is strongly discouraged. The condition of the water body is expected to be unsafe for human and animal exposure. Protect your pets from entering the water, drinking water, or coming in contact with any scum found on the shore.

Eagle Wash

Placer Cove 

A suspect HAB has been observed at the South Meadows Community Pond in Reno.

Hazardous conditions are possible or present. People and pets should use caution when in contact with water and avoid areas of algae accumulation.

A suspect HAB has been observed at Baily Pond in Reno.

Hazardous conditions are possible or present. People and pets should use caution when in contact with water and avoid areas of algae accumulation.

Chimney Reservoir has been placed on a HAB Watch Advisory after visual observations of algae having the appearance of surface cyanobacteria.

Hazardous conditions are possible or present. People and pets should use caution when in contact with water and avoid areas of algae accumulation.

Washoe Lake (Big) has been placed on a HAB Watch Advisory after visual observations of algae having the appearance of surface cyanobacteria.

Hazardous conditions are possible or present. People and pets should use caution when in contact with water and avoid areas of algae accumulation.

Lahontan Reservoir’s previous HAB Watch Advisory has been increased to a HAB Warning Advisory. Satellite data indicates very high concentrations of cyanobacteria on the water surface. The condition of the water body is expected to be unsafe for human and animal exposure.  Human or animal contact with visible blooms is discouraged.

Signs that there may be an HAB in the water:

• The water smells rotten
• The water looks like paint
• Large mats or scums are floating on surface
• There are bright colors like blue, green, white, brown or red

The Nevada Division of Public and Behavioral Health (DPBH) is working with Nevada Division of Environmental Protection, Nevada State Parks and the Nevada Department of Wildlife to ensure the health and safety of Nevadans and their pets who may visit locations where a Harmful Algal Bloom (HAB) has occurred.

If a HAB is suspected, individuals should take the following precautions:  

• Do not allow pets to play in or drink water during a bloom
• Do not swim or play in water with a bloom
• Do not drink, cook with or wash dishes with affected water

People exposed through direct skin contact, ingestion or inhalation may experience irritation of the skin, eyes, nose, throat, and/or respiratory tract. Symptoms to look for include: 

• Rashes, hives, or blisters
• Runny nose, sore throat, asthma, or allergic-like reactions

People exposed through ingesting cyanotoxins may experience: 

• Abdominal pain
• Headache
• Neurological symptoms
• Vomiting
• Diarrhea
• Liver damage and/or kidney damage

For more information and tips about HABs visit Environmental Health | The Office of State Epidemiology. Individuals who believe they may be experiencing symptoms of exposure to algal toxins should contact their local health care provider or contact the Poison Control Center: 1-800-222-1222.

To keep current with advisory recommendations, click here to access our dashboard