Assured water supply requirements apply inside the AMAs. Adequate water supply requirements, meanwhile, apply outside the AMAs. The Adequate Water Supply Program serves primarily as a consumer advisory measure to inform home buyers about the adequacy or inadequacy of the water supply. Inside the AMAs, the Assured Water Supply program requires developers to demonstrate an assured water supply prior to selling lots. The Assured Water Supply requirements are designed to protect and preserve groundwater supplies in the AMAs as well as to ensure sufficient water supplies for new development.
To obtain an adequate water supply determination, the water supply must meet the following requirements: (1) the water supply must be physically available; (2) the water supply must be continuously available; (3) the water supply must be legally available; (4) financial capability to construct the water delivery system and any storage or treatment works must be demonstrated; and (5) the water supply must meet applicable water quality standards. Outside of the AMAs, developers can sell lots to homebuyers with an inadequacy determination from the Arizona Department of Water Resources (ADWR), unless the subdivision is located in a mandatory adequacy jurisdiction.
Inside the AMAs, where the Assured Water Supply requirement applies, the above five requirements must be met in addition to the following two: (1) groundwater use must be consistent with the management plan for the AMA; and (2) groundwater use must be consistent with the management goal of the AMA.