Wash. Rev. Code § 87.84.071
The special assessments provided for in RCW 87.84.070 shall be subject to and inferior to existing local improvement district assessments of any city or town which is included within the boundaries of an irrigation and rehabilitation district. The collection of local improvement district assessments of a city or town, and the right to foreclose the same when delinquent, shall not be impaired in any manner whatsoever by subsequent special assessments of an irrigation and rehabilitation district. In the event that the county treasurer forecloses on land located within the corporate limits of a city or town for nonpayment of irrigation and rehabilitation district assessments, the certificates of sale and the deeds issued pursuant to the foreclosure proceedings shall contain a recital that the certificate of sale and/or deed is subject to outstanding local improvement district assessments of the city or town.
RCW 87.84.071