Cal. Sts. & High. Code § 22160

The tax collector shall, within 30 days after the date of delinquency, begin the publication or posting of a notice that the lots or parcels of land upon which the assessments have not been paid will be sold. The publication shall be made by two consecutive insertions in a daily or weekly newspaper published and circulated in the city. If there is no such newspaper, the notice shall be given by posting in three public places in the city.