(1) The board of county commissioners of each county shall be ex officio, by virtue of their office, supervisors of the zones created in each county. In any zone with more than two thousand residents, an election of supervisors other than the board of county commissioners may be held as provided in this section.
(2) When proposed by citizen petition or by resolution of the board of county commissioners, a ballot proposition authorizing election of the supervisors of a zone shall be submitted by ordinance to the voters residing in the zone at any general election, or at any special election which may be called for that purpose.
(3) The ballot proposition shall be submitted (a) if the board of county supervisors enacts an ordinance submitting the proposition after adopting a resolution proposing the election of supervisors of a zone; or (b) if a petition proposing the election of supervisors of a zone is submitted to the county auditor of the county in which the zone is located that is signed by registered voters within the zone, numbering at least fifteen percent of the votes cast in the last county general election by registered voters within the zone.
(4) Upon receipt of a citizen petition under subsection (3)(b) of this section, the county auditor shall determine whether the petition is signed by a sufficient number of registered voters, using the registration records and returns of the preceding general election, and, no later than forty-five days after receipt of the petition, shall attach to the petition the auditor's certificate stating whether or not sufficient signatures have been obtained. If the signatures are found by the auditor to be insufficient, the petition shall be returned to the person filing it.
(5) The ballot proposition authorizing election of supervisors of zones shall appear on the ballot of the next general election or at the next special election date specified under RCW 29A.04.330 occurring sixty or more days after the last resolution proposing election of supervisors or the date the county auditor certifies that the petition proposing such election contains sufficient valid signatures.
(6) The petition proposing the election of zone supervisors, or the ordinance submitting the question to the voters, shall describe the proposed election process. The ballot proposition shall include the following:
□ "Against the direct election of flood control zone district supervisors."
(8) The costs and expenses directly related to the election of zone supervisors shall be borne by the zone.