Wash. Rev. Code § 53.12.021
Any less than countywide port district that uses commissioner districts may cease using commissioner districts as provided in this section.
A ballot proposition authorizing the elimination of commissioner districts shall be submitted to the voters of a less than countywide port district that is divided into commissioner districts if (1) a petition is submitted to the port commission proposing that the port district cease using commissioner districts, that is signed by registered voters of the port district equal in number to at least ten percent of the number of voters who voted at the last district general election; or (2) the port commissioners adopt a resolution proposing that the port district cease using commissioner districts. The port commission shall transfer the petition or resolution immediately to the county auditor who shall, when a petition is submitted, review the signatures and certify its sufficiency. A ballot proposition authorizing the elimination of commissioner districts shall be submitted at the next district general election occurring sixty or more days after a petition with sufficient signatures was submitted. If the ballot proposition authorizing the port district to cease using commissioner districts is approved by a simple majority vote, the port district shall cease using commissioner districts at all subsequent elections.
RCW 53.12.021