California Codes, Code of Civil Procedure - CCP, Part 2 — Of Civil Actions, Title 10 — Actions in Particular Cases, Chapter 9 — Validating Proceedings, Section 861.1
The summons shall be directed to “all persons interested in the matter of [specifying the matter],” and shall contain a notice to all persons interested in the matter that they may contest the legality or validity of the matter by appearing and filing a written answer to the complaint not later than the date specified in the summons, which date shall be 10 or more days after the completion of publication of the summons. The summons shall provide a detailed summary of the matter the public agency or other person seeks to validate. The summons shall also state that persons who contest the legality or validity of the matter will not be subject to punitive action, such as wage garnishment or seizure of their real or personal property. Except as otherwise specified in this section the summons shall be in the form prescribed in Section 412.20.
Notes
Requires the summons to address all persons interested in the specified matter, explain that they may contest it by written answer by a date at least 10 days after publication ends, and provide a detailed matter summary. It must state that contesting persons face no punitive action; otherwise, the prescribed civil-summons form applies.
Use as reference
Lexinter.net | California Code, Code of Civil Procedure - CCP § 861.1 | https://laws.lexinter.net/codes/california/code-of-civil-procedure/part-2/title-10/chapter-9/section-861-1