Allows the state, cities, and regulated water utilities that own long-farmed land in McMullen Valley to pump deep groundwater and move it to active management areas La Paz County, or city providers. Requires water studies, meters, monthly reports, and strict per-acre limits to slow declines. Charges fees to the source county, which can fund local well repairs and water-hauling tanks. Expands home-sale disclosures on wells and hauling. Lets districts build wells and standpipes, with limited eminent domain.