The Health Disaster Management (HDM) Division coordinates the Agency's emergency response functions related to all-hazards planning, including bioterrorism, pandemic influenza, natural disasters, the county-wide Emergency Medical system for medical emergencies, and other County health-related disasters.

HDM participates in and supports ongoing all-hazards planning and preparation activities undertaken by the Orange County Operational Area (OA) and is responsible for coordinating organized planning efforts with County departments, local cities and special districts to mitigate against, prepare for, respond to, and recover from disasters.

HDM plays a supportive role to the County Emergency Operation Center (EOC) by maintaining a continual state of readiness and by designing, conducting, and evaluating periodic emergency staff training and simulated disaster preparedness and response exercises.