California Code, Education Code - EDC § 46602

(a) If the county board of education determines that the pupil should be permitted to attend the school district of proposed enrollment, the pupil shall be admitted to school in the school district without delay and the attendance may be counted by the school district of enrollment for state apportionment purposes.

(b) Written notice of the decision by the county board of education shall be delivered to the parent and to the governing boards of the school districts.  Notice shall conform to the requirements of Section 48985 and may be provided using any of the following methods: