Section 24020 Of Article 4. Actions And Proceedings From California Water Code >> Division 11. >> Part 7. >> Chapter 4. >> Article 4.

. All acts, proceedings, conclusions, and findings of fact, including the levy of an assessment, by a board of a district concerning an improvement district therein shall be conclusive except in an action or proceeding instituted within six months after the acts, proceedings, conclusions, or findings were had or made.