Iowa Code Title IX. Local Government [Chs. 331-420] § 335.2. Farms exempt

1. Except to the extent required to implement section 335.27, no ordinance adopted under this chapter applies to land, farm houses, farm barns, farm outbuildings, or other buildings or structures that are primarily adapted, by reason of nature and area, for use for agricultural purposes, while so used.  However, the ordinances may apply to any structure, building, dam, obstruction, deposit, or excavation in or on the floodplains of any river or stream.

2. A county shall not require an application, an approval, or the payment of a fee in order for an ordinance to be deemed inapplicable to land, farm barns, farm outbuildings, or other buildings or structures that are primarily adapted for use for agricultural purposes under this section.

3. Land, farm houses, farm barns, farm outbuildings, or other buildings or structures may qualify under this section independently or in combination with other agricultural uses.  Land enrolled in a soil or water conservation program shall be considered land primarily adapted for use for agricultural purposes under this section.