California Code, Health and Safety Code - HSC § 5473.9

The tax collector may, in his discretion, issue separate bills for such charges and separate receipts for collection on account of such charges. The county shall be compensated for services rendered in connection with the levy, collection and enforcement of such charges for an entity other than the county in an amount to be fixed by agreement between the board of supervisors and the legislative body of the entity. The compensation shall not exceed five dollars ($5) for each account handled, or 1 percent of all money collected, whichever is greater. The compensation shall be paid into the county salary fund.