The Chino Hills Police Department is seeking any possible victims of 59-year-old Peter Anthony McGuire.
The woman contacted deputies last Thursday and said she had managed to escape, the San Bernardino County Sheriff's Department said in a statement.
She claims she had been tortured, physically assaulted and raped by McGuire.
Authorities said the victim had visible injuries consistent with the allegations made.
McGuire allegedly held the woman at the home for months. Investigators say she moved in earlier this year.
Investigators said they tracked McGuire to a Placentia home, where they served a search warrant Saturday morning, June 11.
After barricading himself inside, McGuire was taken into custody after surrendering.
Neighbors in Placentia said the suspect lived there for years but hardly talked to anyone.
McGuire faces numerous charges, including kidnapping, torture, mayhem, rape, false imprisonment and assault with a deadly weapon.
McGuire pleaded not guilty to all charges. He is being held without bail.
If you are a victim or have information about this case, you're urged to contact Det. Ryan Girard or Dep. Dan Renear at the Chino Hills Station at 909-364-2000.
For victims outside of San Bernardino County, please contact local law enforcement.
The Associated Press contributed to this report.