Cal. Educ. Code § 35786

An order of a county committee attaching the territory of a lapsed school district to one or more adjoining school districts shall be effective for all purposes on the July 1 after date of the order. Notwithstanding Section 35534, the effective date of the order is not subject to compliance with Section 54900 of the Government Code. Compliance with Section 54900 of the Government Code is required by December 1 of the year in which the order is made.