The treated water will be pumped 15 miles from Flagstaff to a resort in the San Francisco Peaks.
There it will be stored in a reservoir from where it can be sprayed through large fans into the cold air to provide artificial snow for the slopes.
The US Environmental Protection Agency say reclaimed water is safe for use provided it is treated .
But some environmentalists quote studies from the US Geological Survey and Northern Arizona University which report that treated water may still contain pharmaceuticals, hormones, industrial pollutants, carcinogens and a wide range of organic chemicals
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