Cal. Bus. & Prof. Code § 7672.8

All cremated remains disposer registrations shall expire at midnight on September 30 of each year. A person desiring to renew his or her registration shall file an application for renewal on a form prescribed by the bureau accompanied by the required fee. A registration that has expired may be renewed within five years of its expiration upon payment of all accrued and unpaid renewal fees. The bureau shall not renew the registration of any person who has not filed the required annual report until he or she has filed a complete annual report with the department.