CAL. HSC. CODE § 114294 : California Code - Section 114294

(a) All mobile food facilities and mobile support units shall meet the applicable requirements in Chapters 1 to 8, inclusive, and Chapter 13, unless specifically exempted from any of these provisions as provided in this chapter.

(b) The enforcement agency shall initially approve all mobile food facilities and mobile support units as complying with the provisions of this chapter and may require reapproval if deemed necessary.

(c) Each mobile food facility that is either a special purpose commercial modular and coach as defined by Section 18012.5 or a commercial modular coach as defined by Section 18001.8 shall be certified by the Department of Housing and Community Development, consistent with Chapter 4 (commencing with Section 18025) of Part 2 of Division 13, and regulations promulgated pursuant to that chapter. In addition, the enforcement agency shall approve all equipment installation prior to operation.