Wahl played club soccer for Slammers FC coached by Walid and Ziad Khoury,[1] and Irvine Strikers, coached by Don Ebert, and played college soccer at the University of California, Berkeley from 2002 to 2005, where he started every game of his career.

He also played two seasons with Orange County Blue Star in the USL Premier Development League.

Wahl scored his first MLS goal, an impressive curling free-kick, on June 26, 2011, in a 2-1 Sounders win over New England Revolution.

[4] Wahl was traded to MLS expansion side Montreal Impact for allocation money on November 23, 2011.

[9] In 2001, Wahl made an appearance for the United States U-17 national team in the FIFA U-17 World Championship.