The mission of the Office of Environmental Health Hazard Assessment (OEHHA) is to protect and enhance public health and the environment by scientific evaluation of risks posed by hazardous substances.


Jan 18, 2017: List of Registered Medical Supervisors
A list of registered medical supervisors in the biomonitoring program who measure cholinesterase activity in blood samples collected from agricultural workers who regularly handle category I and II organophosphate and carbamate pesticides.
Jan 12, 2017: Free Training for Healthcare Providers
Courses are available on-line or on-site. Each course is approximately one hour, and continuing education credits may be provided.  Courses are available in English and Spanish.
Jan 9, 2017: CalEnviroScreen 3.0
Information on CalEnviroScreen 3.0, with links to press releases, map of the overall CalEnviroScreen 3.0 scores and additional data.