California Code, Unemployment Insurance Code - UIC § 1379

(a) File a civil action against the liable person for the recovery of the amount of the overpayment within one year after any of the following, or, in cases where the individual has been overpaid benefits due to fraud, misrepresentation, or nondisclosure as described in Section 1375.1, or where the director has found an overpayment pursuant to Section 1375.7, within three years of any of the following:

(b) Initiate proceedings for a summary judgment against the liable person. However, this subdivision applies only where the director has found, pursuant to Section 1375, that the overpayment may not be waived because it was due to fraud, misrepresentation, or willful nondisclosure on the part of the recipient or where the director has found an overpayment pursuant to Section 1375.7. The director may, not later than three years after the overpayment became final, file with the clerk of the proper court in the county from which the overpayment of benefits was paid or in the county in which the claimant resides, a certificate containing all of the following:

(c) Reduce or vacate a summary judgment by filing a certificate to that effect with the clerk of the proper court.

(d) Offset the amount of the overpayment received by the liable person against any amount of benefits to which they may become entitled under this division within six years of the date of the service of the notice of overpayment determination.