California Code, Streets and Highways Code - SHC § 27110

When the results of the final judgments upon all protests have been certified to the Secretary of State, he shall issue his certificate of incorporation declaring the district with the boundaries as finally established to be duly incorporated. He shall file the original certificate of incorporation in his office, and have a certified copy of the certificate recorded in the office of the county recorder of each of the counties having any territory within the boundaries of the district.