Cal. Government Code § 27302

(a) A county recorder shall be deemed to be in compliance with the requirements of Section 27301 and shall not be liable for failure to truncate a social security number if he or she uses due diligence to locate social security numbers in official records and truncate social security numbers in the public record version of those official records. The use of an automated program with a high rate of accuracy shall be deemed to be due diligence. (b) In the event that a county recorder fails to truncate a social security number contained in a public record, any person may request that the county recorder truncate the social security number contained in that record. Notwithstanding that a county recorder may be deemed to be in compliance with Section 27301 pursuant to subdivision (a), a county recorder that receives a request that identifies the exact location of an untruncated social security number within a specifically identified public record, shall truncate that number within 10 business days of receiving the request. The public record with the truncated social security number shall replace the record with the untruncated number.