California Code, Streets and Highways Code - SHC § 19303

If the certifying officer certifies that the petition bears the signatures of the owners of taxable property within the proposed zone representing 60 percent or more of the total assessed value of all taxable property in the zone, the petition shall be filed, and the board of supervisors shall fix a time for hearing the petition and the protests of interested parties, and shall cause a notice of the filing of the petition and the time set for the hearing to be published pursuant to Section 6061 of the Government Code in a newspaper designated by the board as most likely to give notice to the inhabitants of the district and the proposed zone.  If there is no such newspaper, copies of the notice shall be posted in three conspicuous places in the proposed zone to be annexed, for three weeks prior to the date fixed for hearing the petition.  The notice shall contain the text of the petition, but the names of the signers of the petition need not be published.  Notice given pursuant to this section is a sufficient compliance with Section 19211.

If the certifying officer's certificate shows that the petition does not bear the required number of signatures, the request for the formation of a temporary zone shall be denied, without prejudice to the filing of a new petition therefor, and the board of supervisors shall proceed to consider and act upon the petition as a petition filed pursuant to Chapter 9 (commencing with Section 19160) or Chapter 12 (commencing with Section 19210), as the case may be.