California Code, Public Resources Code - PRC § 4433

(a) A person shall not light, maintain, or use a campfire upon brush-covered land, grass-covered land, or forest-covered land that is the property of another person unless the person first obtains a written permit from the owner, lessee, or agent of the owner or lessee of the property.

(b) If, however, campsites and special areas have been established by the property owner and posted as areas for camping, a permit is not necessary.

(c) A written campfire permit duly issued by or under the authority of the United States Forest Service is necessary for use on land under the jurisdiction and control of the United States Forest Service.