Harmful algal blooms grow in water and can make you and your pets sick.
Stay out of water that looks discolored, is scummy, or smells bad.
Harmful algal blooms can cause mild to life-threatening illnesses in people and animals.
Check for water advisories and stay out of water that looks or smells bad to avoid getting sick.
For professionals
OHHABS collects data about harmful algal blooms and the human and animal illnesses they cause.
Find resources related to outbreak response, communications, reporting, and more.
Harmful algae cause mild to severe illnesses through ingestion, inhalation, and skin contact.
Harmful algal blooms can be deadly for animals. Quick supportive care can save animals' lives.
Health departments or their partners report information in OHHABS.
Resources
Download, use, and share free materials about preventing illnesses caused by harmful algae.
Use CDC graphics and sample messages to share information about harmful algae on social media.
Find national data about harmful algal blooms and the human and animal illnesses they cause.