Cal. Welf. and Inst. Code § 751
The expense of the transfer and all expenses in connection with the transfer and for the support and maintenance of such person shall be paid from the county treasury of the court ordering the transfer until the receipt and filing of the finding and order of transfer in the juvenile court of the transferee county.
The judge shall inquire into the financial condition of such person and of the parent, parents, guardian, or other person charged with his support and maintenance, and if he finds such person, parent, parents, guardian, or other person able, in whole or in part, to pay the expense of such transfer, he shall make a further order requiring such person, parent, parents, guardian, or other person to repay to the county such part, or all, of such expense of transfer as, in the opinion of the court, is proper. Such repayment shall be made to the probation officer who shall keep suitable accounts of such expenses and repayments and shall deposit all such collections in the county treasury.
Ca. Welf. and Inst. Code § 751