Washington Revised Code Title 36. Counties § 36.36.045. Lien for delinquent fees

(1) At least eighteen months have passed since the first billing for a delinquent fee installment; and

(2) At least three billing notices and a letter have been mailed to the property owner, within the period specified in subsection (1) of this section, explaining that a lien may be imposed for any delinquent fee installment that has not been paid in that period.

The lien shall otherwise be subject to the provisions of chapter 36.94 RCW related to liens for delinquent charges. The county shall record liens for any delinquent fees in the office of the county auditor. Failure on the part of the county to record the lien does not affect the validity of the lien.