Cal. Sts. & Hy. Code § 35276
No action, proceeding or defense to correct, set aside, cancel, avoid, annul or otherwise attack any proceedings under this part up to and including the adoption of the ordinance declaring the district formed shall be maintained by any person unless such action, proceeding or defense is commenced or made within 30 days after the adoption of such ordinance. No action, proceeding or defense to correct, set aside, cancel, avoid, annul or otherwise attack any proceedings under this part taken subsequent to the adoption of said ordinance, including but not limited to proceedings taken and determinations made pursuant to Sections 35402 and 35402.3, shall be maintained by any person unless such action, proceeding or defense is commenced or made within 30 days after the taking of such proceedings.
Ca. Sts. and High. Code § 35276