EPA employees will be furloughed beginning Saturday if Congress and President Donald Trump can’t reach a deal by then to extend funding for about one-quarter of the government.

The Environmental Protection Agency has enough funding to continue running only through the end of this week, EPA Acting Administrator Andrew Wheeler wrote in a Dec. 27 email sent to agency employees, and obtained by Bloomberg Environment.

“However, in the event an appropriation is not passed by midnight Friday, December 28th, EPA...