Authorities responded to the 11800 block of 223rd Street just after 7:30 a.m. According to the Los Angeles County Sheriff's Department, a relative discovered the bodies when stopping by the house to check on them.
One body was found in a bedroom, and two other bodies were found in the garage. The victims have not yet been identified.
Three deputies were taken to a nearby hospital after being overcome by fumes at the scene, the sheriff's department said. One deputy has already been released.
Deputies say chemicals were being stored inside the garage but have not said what kind.
A cause of death has not been determined. Anyone with information is urged to call the Los Angeles County Sheriff's Department Homicide Bureau at (323) 890-5500.