Ariz. Rev. Stat. § 45-579
A. A holder of a certificate of assured water supply issued pursuant to section 45-576 may assign the certificate, in whole or in part, to another person if the holder applies to the director for approval within ten years after the original certificate was issued and the director approves the application. An application may be filed under this section more than ten years after the original certificate was issued if a minimum of five hundred lots within the subdivision covered by the certificate have been sold to individual home buyers by the holder of the certificate and any previous holders of the certificate. An application filed under this section shall be on a form prescribed by the director. The director shall approve a timely application for assignment of a certificate of assured water supply if the director determines that all of the following apply: