TUCSON, Ariz. (AP) — A judge delivered a setback Tuesday to a giant development in Sierra Vista, siding with conservationists who say the project lacks a sustainable water supply.

The ruling by Maricopa County Superior Court Judge Crane McClennen reversed a 2013 decision by the Arizona Department of Water Resources that found there is enough ground water from the San Pedro River basin to sustain 7,000 new homes and offices in Sierra Vista for at least 100 years.