Cal. Food & Agric. Code § 75636

Any producer or handler who fails to file a return or pay the assessment within the time required by the commission shall pay to the commission a penalty of 10 percent of the amount of the assessment determined to be due and, in addition, pay 1.5 percent interest per month on the unpaid balance. In addition to any other penalty imposed, the commission may require any person who fails to pay any assessment or related charge pursuant to this article to furnish and maintain a surety bond in a form and amount, and for a period of time, specified by the commission, as assurance that all payments to the commission will be made when due.