WPGA is a trade and membership service organization that represents propane marketers throughout California. Founded in 1949. #WPGA #WesternPropane The Western Propane Gas Association is a trade and membership service organization that represents propane marketers throughout California. Founded in 1949, the association has grown in its influence while maintaining its core principles of education and safety. The association’s primary purpose is to maintain high standards of practice within the industry, and in so doing, protect and expand the ability of its members to compete in the marketplace.