California Code, Health and Safety Code - HSC § 123865

If the parents or estate of a handicapped child is wholly or partly unable to furnish for the child necessary services, the parents or guardian may apply to the agency of the county that has been designated by the board of supervisors of the county of residence under the terms of Section 123850 to administer the provisions for handicapped children. Residence shall be determined in accordance with Sections 243 and 244 of the Government Code.