Scott Pruitt, the head of the Environmental Protection Agency, spent roughly $3.5 million in taxpayer funds on his personal security detail during his first year in office, 1.7 times what his predecessors spent each year on average, according to records made public Friday by the agency. Those figures included $2.7 million on salaries and overtime for security staff and more than $760,000 on travel for security agents.

Under Mr. Pruitt, E.P.A. Security Payroll Costs Have Risen Sharply Security Detail Payroll Costs, Quarterly Mr. Pruitt’s first full quarter $600k 400k 200k F.Y. 2010 2012 2014 2016 2018 Mr. Pruitt’s first full quarter $600k 400k 200k F.Y. 2010 2012 2014 2016 2018 By The New York Times | Source: Environmental Protection Agency. Adjusted for inflation.

Mr. Pruitt, whose spending practices have come under scrutiny from Congress, has round-the-clock protection and at least 20 people on his security detail. In his first year, he often flew first class while traveling, citing security concerns. In March, he said that he intended to start flying coach.

Travel Costs for E.P.A. Security Agents Spiked, Too Security Detail Travel Costs, Quarterly $200k Mr. Pruitt’s first full quarter 150k 100k 50k F.Y. 2010 2012 2014 2016 2018 $200k Mr. Pruitt’s first full quarter 150k 100k 50k F.Y. 2010 2012 2014 2016 2018 By The New York Times | Source: Environmental Protection Agency. Adjusted for inflation.

During the Obama administration, the E.P.A. spent between $1.7 million and $2.3 million annually, adjusted for inflation, on security details for the two previous E.P.A. chiefs, Lisa P. Jackson and Gina McCarthy. After Mr. Pruitt took office, the spending on security increased sharply.

“Administrator Pruitt has faced an unprecedented amount of death threats against him,” said Jahan Wilcox, an agency spokesman. “To provide transparency, E.P.A. will post the costs of his security detail and proactively release these numbers on a quarterly basis.”

The E.P.A. inspector general has opened more threat investigations under Mr. Pruitt than it did under Ms. McCarthy. But Senate Democrats have argued that those investigations do not justify the agency’s large increases in security spending. They have cited a February memo from the agency’s homeland security office that said it could not identify “any specific credible direct threat to the E.P.A. Administrator.”