California Code, Probate Code - PROB § 19003

(a) At any time following the death of the settlor, and during the time that there has been no filing of a petition to administer the probate estate of the deceased settlor in this state of which the trustee has actual knowledge, the trustee may file with the court a proposed notice to creditors. Upon the court's assignment of a proceeding number to the proposed notice, the trustee shall publish and serve notice to creditors of the deceased settlor in the form and within the time prescribed in Chapters 3 (commencing with Section 19040) and 4 (commencing with Section 19050). That action shall constitute notice to creditors of the requirements of this part.

(b) The filing shall be made with the superior court for the county in this state where the deceased settlor resided at the time of death, or if none, in any county in this state in which trust property was located at the time of the settlor's death, or if none, in the county in this state that was the principal place of administration of the trust at the time of the settlor's death.

(c) Nothing in subdivision (a) affects a notice or request to a public entity required by Chapter 7 (commencing with Section 19200).