Ariz. Rev. Stat. § 11-981
A. In addition to authority granted pursuant to other provisions of law or city charter, any city, town, county, special health care district organized pursuant to title 48, chapter 31, political subdivision entity or other political subdivision that is located in a county with a population of more than one million persons and whose governing body is composed of members of a county board of supervisors may procure insurance from any insurer authorized by the director of the department of insurance and financial institutions or may establish a self-insurance program for the management and administration of a system for direct payment of benefits, losses or claims or any combination of insurance and direct payments, and including risk management consultation, to provide:
B. If any city, town, county, special health care district organized pursuant to title 48, chapter 31, political subdivision entity or other political subdivision that is located in a county with a population of more than one million persons and whose governing body is composed of members of a county board of supervisors establishes a self-insurance program for the management and administration of a system for direct payment of benefits, losses or claims pursuant to subsection A, the governing body of such city, town, county, special health care district organized pursuant to title 48, chapter 31, political subdivision entity or other political subdivision that is located in a county with a population of more than one million persons and whose governing body is composed of members of a county board of supervisors shall place all monies into a trust fund for the purposes of this section in amounts as determined appropriate by the governing body of the city, town, county, special health care district organized pursuant to title 48, chapter 31, political subdivision entity or other political subdivision that is located in a county with a population of more than one million persons and whose governing body is composed of members of a county board of supervisors, except that any city, town, county, special health care district organized pursuant to title 48, chapter 31 or other political subdivision that is located in a county with a population of more than one million persons and whose governing body is composed of members of a county board of supervisors establishing such a trust fund shall: