AZ SB1328

Amends procedures for designating "subsequent irrigation non-expansion areas" by requiring petitions to include a numeric groundwater flow model and hydrologic report signed by a registered professional geologist or engineer.

Changes the definition of "reasonably safe supply for irrigation" to mean a reliable groundwater source for 100 years and allows the director to consider credible evidence of likely future changes to withdrawal rates when making sufficiency determinations.

Establishes eligibility requirements for irrigation users signing petitions, limiting signers to landowners (not lessees) who irrigated two or more acres within the five-year period before petition submission and are capable of future irrigation.

Makes the director's decision to approve a petition non-subject to judicial review, but allows appeals of decisions denying petition compliance and limits judicial review of non-expansion area designations to petitioners and those who submitted evidence at the public hearing.

Specifies that if the director declines designation and that decision is reversed on judicial review, acres irrigated after the initial refusal may continue to be irrigated; prohibits refiling petitions for the same area within three years of a refusal that becomes final.