Ariz. Rev. Stat. § 48-179
A. After the execution of any contract or agreement contemplated by this article, the governing body of a district may file a petition in the superior court in the county in which the office of the district is located to determine the validity:
B. The action shall be in the nature of a proceeding in rem and jurisdiction of all parties interested shall be acquired by notice given as provided in section 48-180. The petition shall set forth: