California Code, Business and Professions Code - BPC § 4996.28

(a) Registration as an associate clinical social worker shall expire one year from the last day of the month during which it was issued.  To renew a registration, the registrant shall, on or before the expiration date of the registration, complete all of the following actions:

(b) An expired registration may be renewed by completing all of the actions described in paragraphs (1) to (5), inclusive, of subdivision (a).

(c) A registration as an associate clinical social worker may be renewed a maximum of five times.  No registration shall be renewed or reinstated beyond six years from the last day of the month during which the registration was issued, regardless of whether the registration has been revoked.  When no further renewals are possible, an applicant may apply for and obtain a subsequent associate clinical social worker registration number if the applicant meets all requirements for registration in effect at the time of their application for a subsequent associate clinical social worker registration number and has passed the California law and ethics examination pursuant to Section 4992.09.  An applicant issued a subsequent associate registration number pursuant to this subdivision shall not be employed or volunteer in a private practice.