An earthen dam built without permits by the Hutterite Brethren near Reardan poses a potential threat to eight downstream homeowners, according to Washington Department of Ecology officials, who have labeled the dam as “hazardous.” The 30-foot high dam, on a tributary of Deep Creek, 14 miles west of Spokane, needs an engineering inspection and a better spillway, said Doug Johnson, Ecology’s supervisor of dam safety.