California Code, Public Utilities Code - PUC § 4460

(a) In each distribution system, the operator shall post on the premises the current emergency telephone numbers for, at a minimum, the operator, the supplier, the fire department, and the responsible person as defined by Section 18603 of the Health and Safety Code, and shall maintain on the premises a copy of the emergency procedures that shall be used in the event there is a propane leak or other safety hazard in the distribution system.  The operator shall inform each of the customers of the location of these emergency telephone numbers and the emergency procedure.

(b) Any operator who fails to comply with subdivision (a) shall be subject to the same penalty set forth in subdivision (a) of Section 4457.  The commission shall enforce this subdivision pursuant to subdivision (b) of Section 4457.