Bob Fredriksen, left, CH2M water operations manager, and David Sypher, public works director, look at the water pumping, Thursday, Aug. 20, 2015, at the Animas Pump Station No. 2 in Flora Vista, 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