Health & Saf. Code, § 25913

(a) (1) The Division of Occupational Safety and Health of the Department of Industrial Relations shall enforce this chapter with respect to the safety of employees as provided in Part 1 (commencing with Section 6300) of Division 5 of the Labor Code.

(2) However, the Division of Occupational Safety and Health shall be responsible for the enforcement of subdivision (b) of Section 25910 only with respect to the manufacture of the substances described there, only when workers are handling such substances, and only if the division or any employee or agent of the division becomes aware of such manufacture. Furthermore, in such cases, the division shall enforce subdivision (b) of Section 25910 by issuing an order prohibiting use or entry, pursuant to the procedure described in Sections 6325 to 6327, inclusive, of the Labor Code, regardless of whether there exists employee exposure, a dangerous condition, improper guarding, dangerous placement, or an imminent hazard, and at any hearing concerning the validity of such an order, no proof need be tendered by the division concerning employee exposure, dangerous condition, improper guarding, dangerous placement, or imminent hazard.

(b) The State Department of Health Services shall have the responsibility for the administration and enforcement of this chapter with respect to its environmental and public health purposes and may commence and maintain all proper and necessary actions to enjoin activities constituting violations of this chapter or to compel the performance of any act specifically required of any person, officer, or board by this chapter with respect to the environmental and public health purposes of this chapter. The state department shall enforce the provisions of Section 25910 in any circumstances or facilities except as provided in subdivision (a) of this section, and, in such event, may notify the Division of Occupational Safety and Health of any violations of such provisions within its jurisdiction.