A year on from returning to his boyhood club after a record-breaking spell at Manchester United, the 32-year-old is set to move to Major League Soccer.
Press Association Sport understands Rooney will complete his switch to Washington by the end of the week, ending his second spell at the Toffees.
Noises from the United States suggests confirmation will come sooner rather than later, with the forward set to kick off a new chapter of his career.
DC United have held a long-standing interest in Rooney, who last summer made an emotional return to Everton after 13 medal-laden years at Old Trafford.
The frontman became all-time top scorer for United and England during his time away from Goodison Park, winning five Premier League titles and a Champions League among a glut of other trophies.
Rooney spoke of an exciting new challenge upon his return to Everton, but is now set to leave halfway through a two-year deal.
Newly-appointed manager Marco Silva and director of football Marcel Brands said earlier this month that they would not stand in his way if he wanted to head to DC United.
“Before I arrived it was something that had already started,” Silva said at his unveiling earlier this month.
“It is something we expect, in the next few days, we will talk with Wayne Rooney (about) because he is a club legend and we need to understand everything.
“The door is open every time for him. We will talk with him but it is Wayne’s decision.”
Brands added: “There is a possibility he could leave. He is talking with Washington, it is not a secret.
“Of course we will talk with him and, if this is a move he wants to make and is the next step in his career, then I can only hope he will return when he is finished there because I think he still is a legend in this club.
“I always hoped do to that at (former club) PSV and I hope to do that here, to use the legends at the club.”
DC United are about to move into their new Audi Field home, which opens against New England Revolution on July 14.
Rooney will not be able to play for the MLS side until the secondary transfer window opens on July 10.
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