Want climate news in your inbox? Sign up for our Climate Fwd: newsletter.

WASHINGTON — The cost of the security services to protect Scott Pruitt, the former head of the Environmental Protection Agency, more than doubled in Mr. Pruitt’s first 11 months on the job and the agency failed to justify his requests for protection, according to a report released Tuesday by the E.P.A.’s inspector general.

The audit found no documented evidence to support Mr. Pruitt’s need for round-the-clock security. Previous E.P.A. administrators typically had received door-to-door escorts.

The cost to taxpayers of protecting the E.P.A. chief grew from $1.6 million spent on security for one of his Obama-era predecessors, Gina McCarthy, to $3.5 million for Mr. Pruitt, the inspector general found.

The report concluded that the E.P.A. administrator’s protective service detail, which provides physical protection and escorts to the E.P.A. chief, has no final, approved operating procedures addressing the level of protection required for the administrator.