Officer Miguel Schiappapietra, 28, a six-year veteran of the force, is expected in court Tuesday to face two counts of lewd acts with a child.
Both victims are under the age of 10, said Sgt. Brian Hudson of the LA County Sheriff's Department Special Victims Bureau.
Hudson said Schiappapietra moved into the Castaic community just five weeks ago, and was most recently stationed at the LAPD's Foothill Station.
Schiappapietra, who is himself a father of young children, is being held on $100,000 bail.