California Revenue & Taxation Code
Cal. Rev. & Tax. Code § 4985
Any delinquent penalty, cost, redemption penalty, interest, or redemption fee, heretofore or hereafter attached, shall upon satisfactory proof submitted by the tax collector, the auditor, or the assessor, be canceled by the auditor upon a showing that the delinquent penalty, cost, redemption penalty, interest, or redemption fee has attached because of either of the following:
# (a)
An error of the tax collector, the auditor, or the assessor.
# (b)
They were unable to complete valid procedures initiated prior to the delinquency date. The collection shall be made upon the further showing that payment of the corrected or additional amount was made within 30 days from the date that the correction was entered on the roll or abstract record.
Source: view the official text