(1) For the purpose of the formation of a fire protection district, a petition designating the boundaries of the proposed district, by metes and bounds, or by describing the lands to be included in the proposed district by United States townships, ranges and legal subdivisions, signed by not less than ten percent of the registered voters who reside within the boundaries of the proposed district who voted in the last general municipal election, and setting forth the object for the creation of the proposed district and alleging that the establishment of the proposed district will be conducive to the public safety, welfare, and convenience, and will be a benefit to the property included in the proposed district, shall be filed with the county auditor of the county in which all, or the largest portion of, the proposed district is located, accompanied by an obligation signed by two or more petitioners, agreeing to pay the cost of the publication of the notice required by this title. The organization of any fire protection district previously formed is hereby approved and confirmed as a legally organized fire protection district in the state of Washington.

(2) The county auditor shall, within thirty days from the date of filing the petition, examine the signatures and certify to the sufficiency or insufficiency of the signatures. If the proposed fire protection district is located in more than one county, the auditor of the county in which the largest portion of the proposed fire protection district is located shall be the lead auditor and shall transmit a copy of the petition to the auditor or auditors of the other county or counties within which the proposed fire protection district is located. Each of these other auditors shall certify to the lead auditor both the total number of registered voters residing in that portion of the proposed fire protection district that is located in the county and the number of valid signatures of such voters who have signed the petition. The lead auditor shall certify the sufficiency or insufficiency of the signatures. The books and records of the auditor shall be prima facie evidence of the truth of the certificate. No person having signed the petition is allowed to withdraw his or her name after the filing of the petition with the county auditor.

(3) If the petition is found to contain a sufficient number of signatures of registered voters residing within the proposed district, the county auditor shall transmit the petition, together with the auditor's certificate of sufficiency, to the county legislative authority or authorities of the county or counties in which the proposed fire protection district is located.