Luis Gonzalez, 62, was arrested for child molestation at his Atwater Village home. He is being held on $1.1 million bail.
Detectives allege that he has also sexually assaulted two others in incidents dating as early as 1998.
Gonzalez has worked for Los Angeles County as a welfare eligibility case worker for the past nine years, a position that provided him access to children. Sheriff's investigators believe there may be other victims.
Anyone with information about Gonzalez' activities is asked to call (805) 383-8791.