Cal. Pub. Util. Code § 4353

(a) The commission shall conduct an initial inspection of each distribution system which shall take place on the mobilehome park premises. The inspection shall consist of all of the following:
1. (1) An inspection of the adequacy of the operator’s operation and maintenance plan.
2. (2) The information contained in the required annual report.
3. (3) The records of leak surveys and repairs, corrosion control, and cathodic protection of the system.
4. (4) If deemed appropriate from the review of the records, a physical inspection of the mobilehome park’s distribution system to ensure compliance with the federal law; the applicable sections of Commission General Order 112 relating to mobilehome park distribution systems, excluding the sections relating to gas transmission facilities, LNG facilities, and gathering lines; and any rules and orders adopted by the commission pursuant to this chapter.
(b) If the operator demonstrates compliance pursuant to subdivision (a), the distribution system shall thereafter be inspected at least once every seven years pursuant to a risk-based inspection schedule adopted by the commission. The subsequent inspections shall consist of the elements specified in subdivision (a). However, the commission may institute an inspection at any time if it determines, following a review of a subsequent annual report or receipt of a complaint, that an additional inspection is necessary.
(c) If the operator does not demonstrate compliance pursuant to subdivision (a), the distribution system may be inspected on an annual basis until such time as there is compliance and, thereafter, shall be inspected as specified in subdivision (b).
(d) If upon the initial inspection or any subsequent inspection, the commission determines the presence of a gas leak or other safety hazard in the distribution system which poses a significant or immediate danger to the health and safety of the park residents, the distribution system may be inspected more frequently until the condition is corrected. Once corrected, the park shall be inspected as specified in subdivision (b).
(e) The commission may require an operator to provide necessary assistance to commission inspectors in entering and inspecting the mobilehome park, including, but not limited to:
1. (1) Allowing commission inspectors entry to mobilehome park premises.
2. (2) Having, upon notice, the necessary records specified in subdivision (a) available for the commission inspector’s review during the physical inspection.
3. (3) Assisting in surveying or uncovering portions of a distribution system for purposes of inspection, verification, and testing.
(f) It shall be a violation for a mobilehome park operator to willfully obstruct a commission inspector’s access, entry, or inspection of a mobilehome park.
(g) The commission may enforce subdivision (f) by issuing a citation in the manner specified in subdivision (b) of Section 4357 and shall notify the United States Department of Transportation, the department or local enforcement agency, the utility serving the distribution system, and the operator of any citation issued pursuant to subdivision (f) of Section 4353.