groundwater replenishment; qualification; subbasin

HB 2258 modifies Arizona's groundwater replenishment rules, requiring water districts to replenish groundwater in the same subbasin where it was withdrawn for qualifying land or service areas after December 31, 2029. It creates a 10-year transition period for municipal water providers with "assured water supply" designations: these providers can gradually assume landowners' replenishment obligations (starting at 10% in year one, reaching 100% by year 10). The bill directly affects landowners in municipal service areas that qualify for assured water supply status, shifting their groundwater replenishment responsibility to the municipal provider. Key provisions include phasing out individual landowner obligations and mandating annual reporting until the transition completes.