Cal. Pub. Util. Code § 1405
Upon the filing of the petition the commission shall make its order to show cause. The order shall specify the nature of the proceeding, contain a general description of the lands, property, and rights which petitioner desires to acquire by condemnation or otherwise, and direct the owners and claimants named in the petition, who shall also be named in the order, to appear before the commission at a time and place specified in the order, to show cause, if any they have, why the commission should not proceed to hear the petition and to fix the just compensation to be paid for the lands, property, and rights.
The order shall direct the executive director of the commission to serve or cause to be served upon each owner and claimant a copy of the order certified under the seal of the commission to which shall be attached a copy of the petition.
Ca. Pub. Util. Code § 1405