California Code, Public Resources Code - PRC § 4225

(a)(1) The fire prevention fee determined to be due by the department pursuant to this article is due and payable at the time it becomes final, and if it is not paid when due and payable, notwithstanding the penalty imposed pursuant to Section 55042 of the Revenue and Taxation Code, a penalty of 20 percent of the fee determined to be due shall be added to the amount due and payable for each 30-day period in which the fee remains unpaid.

(2) On and after January 1, 2015, the penalty imposed pursuant to paragraph (1) shall not be imposed or added to any fee that remains unpaid or any fee that is not paid when due and payable.