4.01    MUNICIPAL INFRACTION.  A violation of this Code of Ordinances or any ordinance or code herein adopted by reference or the omission or failure to perform any act or duty required by the same, with the exception of those provisions specifically provided under State law as a felony, an aggravated misdemeanor, or a serious misdemeanor, or a simple misdemeanor under Chapters 687 through 747 of the Code of Iowa, is a municipal infraction punishable by civil penalty as provided herein.

(Code of Iowa, Sec. 364.22[3])