Longtime California GOP legislative staffer to lead EPA Region 9

By Alex Nieves | 03/18/2025 04:16 PM EDT

Josh F.W. Cook will oversee the Trump administration’s environmental work in California and other Western states.

The U.S. Environmental Protection Agency's logo.

President Donald Trump named Josh F.W. Cook as EPA's Region 9 administrator. Justin Sullivan/Getty Images

President Donald Trump on Tuesday appointed Josh F.W. Cook to lead EPA’s Region 9 office.

Cook, a veteran California GOP staffer and consultant, will be tasked with guiding the Trump administration’s deregulation push in a region stretching from the Southwest to Guam.

Cook, who recently served as chief of staff for former California state senator and gubernatorial candidate Brian Dahle, will be charged with overseeing the Trump administration’s environmental programs and for a region that includes California, Arizona, Hawaii, Nevada and the United States’ Pacific island territories.

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Why it matters: Cook will play a leading role in EPA’s efforts to unwind dozens of regulations on climate change, air quality, wastewater, chemicals and more, top Trump priorities that EPA Administrator Lee Zeldin turbocharged last week.

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