Cal. Public Resources Code § 4430

During any time of the year when burning permits are required in an area pursuant to this article, a person, copartnership, firm, corporation or company, shall not use or operate in such area any steam-operated engine, machine equipment, mill or industrial plant, located on or near forest-covered land or brush-covered land, without providing one adequate force pump or water under pressure equivalent to a pump, and not less than 200 feet of hose not less than one inch in diameter for each steam-operated engine or equipment. The pump or water pressure required in this section shall be capable of applying a minimum of 40 pounds pressure at the nozzle on 200 feet of hose, such nozzle to be one-fourth inch or larger in diameter. If two steam-operated engines or steam equipment are customarily operated within 100 feet of each other, only one engine or piece of equipment need be equipped with pump and hose. This section does not apply to any internal combustion engine or to any steam or other locomotive which is being used in the business of a common carrier by railroad.