The people who live in the northwest corner of New Mexico consider Darlene Arviso to be a living saint.
"Everybody knows me around here. They'll be waving at me," she says from behind the wheel of the St. Bonaventure Indian Mission water truck. "They call me the water lady."
That's because Arviso hauls water for tribe members of the Navajo Nation, where, on average, residents use 7 gallons a day to drink, cook, bathe and clean. The average person in the U.S. uses about 100 gallons a day.