The Farm Housing provisions of the United States Code define a colonia as a community that (1) is in the state of Arizona, California, New Mexico, or Texas; (2) is within 150 miles of the Mexico–U.S. border (except for any metropolitan area exceeding one million people); (3) on the basis of objective criteria, lacks adequate sewage systems and lacks decent, safe, and sanitary housing; and (4) existed as a colonia before November 28, 1990.