For some, the very idea of privatizing water — a substance essential to human life on this planet — is simply unthinkable. Clean water is the right of every person, they would argue.

But if the history of water management in the western states is any indication, treating water as the commodity it is would go a long way toward curbing waste, improving delivery and ensuring that thirsty, growing cities have enough water to sustain themselves in an era of ongoing drought.