Cal. Health & Safety Code § 4613

A certified copy of the resolution which establishes the district shall be recorded in the office of the county recorder. Certified copies of such resolution, together with a map or plat which shows such boundaries, shall also be filed with the county assessor, the county clerk, and the State Board of Equalization. Upon such recordation in the office of the county recorder, the district is organized. No action or proceeding which contests the validity of the district or its organization shall be had or taken in any court, state or federal, unless it is commenced within 60 days from the date of the recordation of the resolution establishing the district in the office of the county recorder.