Revenue and Taxation Code § 3955
CHAPTER 10. Rights of Purchaser of Tax-Deeded Property, or Any Other Person Claiming Through Him, to Bring Action to Determine Adverse Claims to or Clouds Upon Tax-Deeded Property Purchased From the State
Whenever unknown defendants owning or claiming an interest in special assessments are made parties defendant, the following persons shall also be made parties defendant: (a) The payee, as shown by the bond representing the special assessment, if any; (b) the owner of the special assessment, or any person claiming an interest therein, as shown by the treasurer’s records; and (c) the treasurer, as collecting agent and trustee of the funds collected for unknown owners of a special assessment or persons claiming an interest therein.