Ariz. Rev. Stat. § 48-910
A. The board of directors of a domestic water improvement district, a domestic wastewater improvement district or a county improvement district that provides or is established for the purpose of providing water or wastewater services shall have the authority to set fees for the district following a public hearing. Fees may include any of the following:
4. For a domestic wastewater improvement district or a county improvement district that provides or is established for the purpose of providing wastewater systems or services, either of the following: