Mark Sigety has owned land in the Harquahala Valley near Tonopah since 2003. Since then, he says several investors have reached out to buy his half-acre plot along with other parcels in western Maricopa County. "I've gotten a lot of letters from investors asking me to call them or get back with them because they wanted to buy my land," Sigety says. "I didn't want to sell it." The Harquahala Groundwater Basin is one of three in rural Arizona set aside specifically to import water to the Valley once water gets scarce.