Treated water storage in ponds at the WPX Energy water recycling plant near Parachute, Colo. The hydrocarbons and chemicals are removed so the water can be used to drill new wells, but it remains quite salty. It's not treated enough to drink or replenish water sources. 

How much water are oil and gas operators recycling? The answer isn’t clear

We continue our series Fracking and Water: The Ripple Effect with a look at how much water the oil and gas industry is recycling. 

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(Photo: CPR/Lesley McClurg)

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