Cal. Rev. & Tax. Code § 7658

If the board finds that a person’s failure to make a timely return or payment was due to a disaster, and occurred notwithstanding the exercise of ordinary care and the absence of willful neglect, the person may be relieved of the interest provided by Sections 7655, 7656, 7659.9, 7661, and 7706. Any person seeking to be relieved of the interest shall file with the board a statement under penalty of perjury setting forth the facts upon which he or she bases his or her claim for relief.