Any person, corporation, or association may apply to the secretary for approval and certification of the applicant's facility as a day training center or a group training home for persons with developmental disabilities, or a combination of both. The secretary may either grant or deny certification or revoke certification previously granted after investigation of the applicant's facilities, to ascertain whether or not such facilities are adequate for the care, treatment, maintenance, training, and support of persons with developmental disabilities, under standards in rules adopted by the secretary. Day training centers and group training homes must meet local health and safety standards as may be required by local health and fire-safety authorities.