Arizona’s tallest mountain is sacred to Hopi, Navajo and other tribes, and for more than a decade the ski resort on it has been making snow out of treated wastewater. The San Francisco Peaks sit on federal land in the Coconino National Forest north of Flagstaff. Humphreys Peak is the highest point in the state. For Hopi people, the mountain is home to the kachina spirits and is central to religious practice. For the Navajo Nation it is one of the four sacred mountains that mark the boundaries of the homeland. Other tribes in the region hold it sacred too. Arizona Snowbowl operates there under a federal permit. Tribes have objected to the resort’s growth going back to at least 1969, when it proposed adding shops, restaurants and lodges. In the early 2000s the City of Flagstaff agreed to sell Snowbowl reclaimed wastewater so it could make artificial snow in a place that does not reliably get enough. The Forest Service approved it after an environmental review. Then came about twenty ...