Cal. Water Code § 12878.3

Any such statement shall not be admissible as evidence in any court action brought against the local agency, its governing body or any member thereof or the State or any of its officials, nor shall the failure of the local agency, its governing body, or any member thereof, or the State or any of its officials, to comply with anything which may be specified as necessary in any such statement, be construed as negligence in any such action.