Cal. Health & Safety Code § 13003

Every person is guilty of a misdemeanor who uses any steam-powered logging locomotive, donkey, or threshing engine, or any other steam engine or steam boiler, in or near any forest, brush, grass, grain, or stubble land, unless the steam engine or steam boiler is provided with adequate devices to prevent the escape of fire or sparks and unless he uses every reasonable precaution to prevent the causing of fire thereby.