Sts. & Hy. Code, § 18097

The tax collector shall, upon the recording of such diagram and assessment, give notice by publication for five days in a daily newspaper, published and circulated in the city, or by two insertions in a weekly newspaper so published and circulated, that the diagram and assessment has been recorded in his office and that all sums assessed therein are due and payable immediately, and that payment of said sums shall be made to him within 30 days after the date of the first publication or posting, which date shall be stated in the notice. The notice shall also contain the statement that all assessments not paid before the expiration of the said 30 days shall be delinquent, and thereupon 5 per cent of the amount of each such assessment shall be added thereto.