Cal. Sts. & High. Code § 8683

If the legislative body conducting the proceedings is not a county and collections of assessments are made by county officials, the county auditor shall, within 90 days after each installment becomes delinquent, render to the city a detailed report showing the amounts of the installments, interest, penalties, and percentages so collected on each proceeding and from what property collected, identifying any properties which are delinquent and the amount and length of time in arrears, and also giving a statement of the percentages retained for the expenses of making such collections.