Section 4787 Of Article 5. Bonds From California Health And Safety Code >> Division 5. >> Part 3. >> Chapter 3. >> Article 5.

. The validity of the bonds after their issuance shall not be questioned in any court except upon the ground that the provisions of this chapter authorizing their issuance are unconstitutional, or that the required hearing regarding the formation of the district was not legally held or proper notice of it was not given.