Wash. Rev. Code § 89.08.150
If a majority of the votes cast at the election are against the creation of the district, the commission shall deny the petition. If a majority favor the district, the commission shall determine the practicability of the project.
In making such determination, the commission shall consider the attitude of the voters of the district; the number of eligible voters who voted at the election; the size of the majority vote; the wealth and income of the land occupiers; the probable expense of carrying out the project; and any other economic factors relevant thereto.
If the commission finds that the project is impracticable it shall enter an order to that effect and deny the petition. When the petition has been denied, no new petition covering the same or substantially the same area may be filed within six months therefrom.
RCW 89.08.150