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Analyzing data for large sewage treatment plants in seven states that rely on Colorado River water, the researchers found California is recycling only 22% of its treated wastewater.

Cook’s appointment comes as the state and region grapple with worsening climate issues such as extreme heat, devastating wildfires and a water crisis on the Colorado River.

If the technology proves viable on a large scale, Gold said, it would help make Southern California less reliant on diminishing imported supplies from the Sacramento-San Joaquin River Delta and the Colorado River.

His appointment comes as the state and region grapple with worsening climate issues such as extreme heat, devastating wildfires and a water crisis on the Colorado River.

California, Arizona and Nevada are urging the Trump administration to change course on the Colorado River.