In this Aug. 18, 2015 photo, Joe Ben Jr., Shiprock Chapter House Farm Board representative, tests the water from tanks at the Chief Hill location in Shiprock, N.M. The quality of San Juan River water on the Navajo Nation has returned to what it was before a spill at a Colorado gold mine sent toxic sludge into the waterway, federal officials said Thursday. (Alexa Rogals/The Daily Times via AP) MANDATORY CREDIT