For purposes of conveyances of irrigation grandfathered rights and type 1 non-irrigation grandfathered rights, whether land to which the right is appurtenant is within the exterior boundaries of the service area of a city, town or private water company shall be determined as of the date of the closing of the conveyance transaction according to the most current map of the service area of the city, town or private water company available for public inspection on that date as required by section 45-498:
A.R.S. § 45-475