Cal. Sts. & High. Code § 8620

After confirmation of the assessment by the legislative body and after the filing of the statement of payments received upon the assessment by the contractor if the assessment was levied under the Improvement Act of 1911, or after 30 days from the date of recording the assessment in the office of the superintendent of streets or district engineer, if the assessment was levied under the Municipal Improvement Act of 1913 or other law, the street superintendent shall make and file with the treasurer a complete list of all unpaid assessments, upon the assessment.