California Code, Health and Safety Code - HSC § 7104

(a) When no provision is made by the decedent, or where the estate is insufficient to provide for interment and the duty of interment does not devolve upon any other person residing in the state or if such person can not after reasonable diligence be found within the state the person who has custody of the remains may require the coroner of the county where the decedent resided at time of death to take possession of the remains and the coroner shall inter the remains in the manner provided for the interment of indigent dead.

(b) A county exercising jurisdiction over the death of an individual pursuant to Section 27491, or who assumes jurisdiction pursuant to Section 27491.55 of the Government Code, shall be responsible for the disposition of the remains of that decedent. If the decedent is an indigent, the costs associated with disposition of the remains shall be borne by the county exercising jurisdiction.