Quaranta was traded to Los Angeles Galaxy from D.C. United for a partial allocation and a conditional draft pick on August 9, 2006.

On June 30, 2007, the Galaxy traded Quaranta to the New York Red Bulls, getting a conditional fourth round pick in the 2008 MLS SuperDraft in return.

He claims to have turned down larger offers from other MLS sides, but felt he still had a point to prove at D.C.[3] His first meaningful game back with D.C. United was as a substitute in the home leg of the quarterfinals of the CONCACAF Champions' Cup against Harbour View of Jamaica.

After coming back from injuries in 2005, Quaranta received his first cap for the senior team July 7, 2005 in a Gold Cup match against Cuba.

He converted a penalty kick in the United States' shootout victory over Panama in the Gold Cup championship game.

[13] In a June 14, 2008 interview with the Washington Post, Quaranta admitted to once having an addiction to painkillers and cocaine, but after a spell in rehab, he has stopped taking both.