Cal. Health & Safety Code § 110125

If substantial objections are made to a federal regulation within 30 days prior to its becoming effective in this state or to a proposed regulation within 30 days after it is published, the department, after notice, shall conduct a public hearing to receive evidence on issues raised by the objections. Any interested person or his or her representative may be heard. The department shall act upon objections by order and shall mail the order to objectors by certified mail as soon after the hearing as practicable. The order shall be based on evidence contained in the record of the hearing. If the order concerns a federal regulation, the department may adopt, rescind, or modify it. If the order concerns a proposed regulation, the department may withdraw it or set an effective date for the regulation as published or as modified by the order. The effective date shall be at least 60 days after publication of the order.