California Code, Business and Professions Code - BPC § 1247.63

(a) Certification of a hemodialysis technician issued by the department pursuant to subdivision (a) of Section 1247.6 shall be valid for four years.

(b) A certified hemodialysis technician applying for renewal of his or her certification shall submit proof that he or she has obtained 30 hours of in-service training or continuing education in dialysis care or general health care as a requirement for the renewal of his or her certification.

(c) An expired certification may be renewed at any time within two years after its expiration on the filing of an application for renewal and documentation of the required in-service education.