California Code, Public Utilities Code - PUC § 4351

(a) “Gas” means natural or manufactured gas, except propane, used for light, heat, or power.

(b) “Distribution system” means a system of pipes within a mobilehome park operated by a person or corporation, other than a public utility, which is connected to a meter or other measuring device under the control of a privately owned or publicly owned public utility, for purposes of distribution of gas by the operator of a mobilehome park to the tenants of the mobilehome park who are the actual users of the gas furnished through the meter or device to the operator by the public utility.

(c) “Operator” is a mobilehome park owner or operator who maintains and operates a master-metered natural gas distribution system.

(d) “Department” means the Department of Housing and Community Development.

(e) “Local enforcement agency” means the city, county, or city and county which has assumed the responsibility for the enforcement of Chapter 2 (commencing with Section 18300) of Part 2.1 of Division 13 of the Health and Safety Code.

(f) “Federal law” or “federal pipeline standards” means the federal Natural Gas Pipeline Safety Act of 1968 (49 U.S.C. Sec. 1671 et seq.) and the regulations contained in Parts 190, 191, and 192 of Title 49 of the Code of Federal Regulations.