Section 13831 Of Article 2. Election From California Health And Safety Code >> Division 12. >> Part 2.7. >> Chapter 3. >> Article 2.

. (a) No informality in any proceeding, including informality in the conduct of any election not substantially affecting adversely the legal rights of any person, shall invalidate the formation of any district.
  (b) The validity of the formation and organization of a district shall not be contested in any proceeding commenced more than 60 days after the date that the formation of the district is complete.