From Ballotpedia
County and municipal requirements
For county and municipal initiatives, any five registered voters of the county or city may file an affidavit with the Clerk establishing a petitioner's committee, making them responsible for circulating the petition and filing it in the proper form. The affidavit must also contain the full text of the proposed initiative ordinance or cite the ordinance sought to be reconsidered, along with a 200 word or less description of the effect of the petition.
Initiative petitions must be signed by a number of registered voters equal to at least 15% of the voter turnout at the preceding general county election or city election. Referendum petitions must be signed by a number of registered voters equal to at least 10% of the voter turnout at the preceding general county election or city election.
Initiative and referendum petitions must be submitted to the respective clerks for verification no later than 180 days after the date the affidavit was filed or 130 days before the election, whichever is earlier.
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