Revenue and Taxation Code § 725

The failure to receive any notice required to be given by the board or the failure of the board to complete any action by a date specified under this chapter, shall not affect the validity of an assessment or the validity of any taxes levied pursuant thereto. When any notice given by the board pursuant to this chapter provides for a time period of less than 10 days, the notice shall also be communicated by telephone on the day the notice is dated.