Cal. Gov. Code § 53340.5

If the legislative body of the local agency levying the special taxes is not the legislative body of a county and those special taxes are collected by county officials, the county auditor shall, at the close of each tax collecting period, promptly provide the auditor of the local agency levying the taxes a detailed report showing the amounts of special taxes, interest, and penalties collected for the district and from which property those revenues were collected, identifying any properties which are delinquent and the amount and length of time in arrears, and a statement of the percentage of the taxes retained by the auditor for the expenses incurred in making the collections and the report.