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University of Puget Sound chemist Dan Burgard keeps a freezer full of archived samples from two wastewater treatment plants in western Washington in case he needs to rerun the samples or analyze a specific drug he didn't test for the first time. Dan Burgard hide caption

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Dan Burgard

The Heartland Biogas facility in Weld County, Colo., is one of the country's largest waste treatment plants that converts methane to natural gas. Rebecca Jacobson/Inside Energy hide caption

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Rebecca Jacobson/Inside Energy

From Poop To Power: Colorado Explores New Sources Of Renewable Energy

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Clean Water Services held a brewing competition in Sept. 2014, inviting 13 homebrewers to make beer from its purified wastewater (as well as water from other sources). Now the company is asking the state for permission for brewers to use its wastewater product exclusively to make beer. /Courtesy of Clean Water Services hide caption

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/Courtesy of Clean Water Services