Cal. Unemp. Ins. Code § 1177.5
(a) If the director determines that an overpayment has been made to the department by an employing unit or the School Employees Fund because of a reason specified in this subdivision, and the amount of the overpayment has been reimbursed to the state by the federal government pursuant to the federal Workforce Investment Act of 1998, then the director shall credit the employing unit or the School Employees Fund with the amount of that overpayment, provided that the director determines that the overpayment was made because of one of the following: