RCW 15.08.160

The lien and interest may be paid on or before the first Monday in October following the entry of the order, upon presenting to the treasurer, a statement from the auditor showing the amount due. Upon payment the treasurer shall stamp the statement and file it in his or her records, and shall issue a receipt to the person making the payment, showing payment and shall deliver a duplicate to the auditor, who shall then cancel the lien.