Cal. Rev. & Tax. Code § 4674
Any excess in the proceeds deposited in the delinquent tax sale trust fund remaining after satisfaction of the amounts distributed under Sections 4672, 4672.1, 4672.2, 4673, and 4673.1 shall be retained in the fund on account of, and may be claimed by parties of interest in the property as provided in, Section 4675. At the expiration of the period specified in subdivision (e) of Section 4675, any excess proceeds not claimed under Section 4675 may be transferred to the county general fund of the county by the county auditor, except that prior to the transfer, the county may deduct those costs of maintaining the redemption and tax-defaulted property files, and those costs of administering and processing the claims for excess proceeds, that have not been recovered under any other law.
Ca. Rev. and Tax. Code § 4674