The legally appointed director of any county health department shall provide equal public health services to all residents of the county including residents of incorporated cities and towns and as consistent with any grant requirements. The county may spend monies for public health services to address a specific public health need that is unique to a particular area or condition. Any city or town may provide services to its residents beyond the county's basic level of service and may use any combination of internal municipal departments or any other provider, including an intergovernmental agreement with a county for the provision of those services.
A.R.S. § 36-190