AZ HB2159

Amends Arizona water supply adequacy requirements to make county board of supervisor provisions mandatory rather than optional, changing language from "may" to "shall" require water adequacy determinations for subdivisions outside active management areas.

Requires county boards of supervisors that adopt water adequacy provisions to notify the director of water resources, environmental quality director, and state real estate commissioner, with restrictions on rescinding or materially amending such provisions.

Expands water supply evaluation requirements to apply statewide by modifying sections 32-2181, 32-2183, and 45-108 to ensure consistent application of "adequate water supply" standards across all jurisdictions outside active management areas.

Clarifies exemption procedures for subdivisions with inadequate water supplies, allowing exemptions only through specific director-granted exceptions under sections 45-108.02 (based on substantial prior capital investment) or 45-108.03 (based on water supply availability within twenty years).

Updates terminology throughout the bill to replace "per cent" with "percent" and standardize language regarding water supply determinations in subdivision plats, public reports, and promotional materials.