A.R.S. § 23-901.06

In addition to persons defined as employees under section 23-901, volunteer workers of a county, city, town, or other political subdivision of the state may be deemed to be employees and entitled to the benefits provided by this chapter upon the passage of a resolution or ordinance by the political subdivision defining the nature and type of volunteer work and workers to be entitled to such benefits. The basis for computing compensation benefits and premium payments shall be four hundred dollars per month.