What We Do

The Office of Environmental Health Hazard Assessment, commonly referred to as OEHHA (pronounced oh-EEE-ha), is a specialized department within the California Environmental Protection Agency (CalEPA). OEHHA is the lead state agency for the assessment of health risks posed by environmental contaminants. OEHHA evaluates harmful chemicals and other environmental hazards, such as extreme heat, to understand interconnected environmental health burdens faced by individuals and communities in California. This allows OEHHA to play a critical and unique role—providing independent analyses to inform science-based decision making.

As CalEPA’s scientific adviser, OEHHA works within CalEPA and across state government, with other state and federal agencies, businesses, community-based organizations, and communities and Native American Tribes across California to develop actionable science that protects public health, especially for those facing multiple environmental hazards.

We invite you to read an overview of Our Programs to learn more about our work. For additional information, Strategic Plan and State Leadership Accountability Report are also available.