Cal. Health & Safety Code § 19167

No city, city and county, or county, nor any employee of any such entity, shall be liable for damages for injury to persons or property, resulting from an earthquake or otherwise, on the basis of any assessment or evaluation performed, any ordinance adopted, or any other action taken pursuant to this article, irrespective of whether such action complies with the terms of this article, or on the basis of failure to take any action authorized by this article. The immunity from liability provided herein is in addition to all other immunities of the city, city and county, or county provided by law.