Liquefied Petroleum Gas (LPG)

This page last reviewed on August 8, 2018


Liquefied petroleum gas, also referred to as LPG or propane, is a flammable mixture of hydrocarbon gases predominantly composed of propane and butane.  LPG is typically obtained through the refinement process of petroleum products or during the separation processing of natural gas sources that are heavy in non-methane components.  At atmospheric pressures and temperatures, LPG will evaporate and therefore is stored in pressurized steel tanks.  As a motor vehicle fuel, LPG is composed primarily of propane with varying butane percentages to adjust for the vaporization pressure.  Title 13, California Code of Regulations, section 2292.6 contains the fuel specifications for liquefied petroleum gas, effective on January 1, 1993.  Three amendments to the fuel specifications have been filed (effective April 13, 1995, January 6, 1998, and December 8, 1999) since that time.

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  • For more information about the Liquefied Petroleum Gas program, please contact Aubrey Gonzalez at (916) 324-3334.