RCW 84.56.260: Continuing responsibility to collect taxes, special assessments, fees, rates, or other charges.

The power and duty to levy on property and collect any tax due and unpaid shall be the responsibility of the county treasurer until the tax is paid; and the certification of the assessment roll shall continue in force and confer authority upon the treasurer to whom the same was issued to collect any tax due and uncollected thereon. This section shall apply to all assessment rolls, special assessments, fees, rates, or other charges for which the treasurer has the responsibility for collection.