A. Every real property lien created under RCW 17.10.170(3) shall be collected by the Assessor-Treasurer in the same manner as a delinquent real property tax according to RCW Chapter 84.64, if within 30 days from the date the owner is sent notice of the lien, including the amount thereof, the lien remains unpaid and an appeal has not been made pursuant to RCW 17.10.180.

B. Liens treated as delinquent taxes shall bear interest at the rate of 12 percent per annum and such interest shall accrue as of the date notice of the lien is sent to the property owner.