Iowa Code § 357C.1A
1. The board of supervisors of any county shall, on the petition of twenty-five percent of the resident property owners in any proposed benefited street lighting district if the assessed valuation of the property owned by the petitioners represents at least twenty-five percent of the total assessed value of the proposed district, or the board of supervisors of any county with a population in excess of two hundred fifty thousand persons shall, on the petition of twenty-five percent of the resident property owners in any proposed benefited lighting district, hold a public hearing concerning the establishment of such proposed street lighting district. Such a petition shall include a statement containing the following:
[C71, 73, 75, 77, 79, 81, §357C.1] C2001, §357.1A 2010 Acts, ch 1061, §180