California Code, Public Utilities Code - PUC § 4356

(a) If 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, it shall notify the United States Department of Transportation, the department or local enforcement agency, the utility serving the distribution system, and the operator, who shall provide notice to the affected tenants in the park.

(b) The commission shall require the operator to take immediate steps to correct and repair the gas leak or other hazard. The park operator shall obtain permits from the department or local enforcement agency, as required by Part 2.1 (commencing with Section 18200) of Division 13 of the Health and Safety Code. The commission may direct the serving gas corporation to terminate service at the master meter if an operator does not comply with this requirement. The cost of repair or corrective actions shall be borne by the operator.