The Iowa Application for Impoundment Structure Property Tax Exemption is a form that allows Iowa property owners to apply for a tax break on certain types of impoundment structures. Impoundment structures are structures that are used for storing water, wastewater, sewage, or other liquids, such as those used for agricultural purposes. The Iowa Application for Impoundment Structure Property Tax Exemption allows qualifying property owners to be exempt from paying property taxes on certain impoundment structures, such as ponds, lagoons, and tanks. There are two types of Iowa Application for Impoundment Structure Property Tax Exemption: the General Exemption and the Agribusiness Exemption. The General Exemption applies to all qualifying impoundment structures owned by the property owner, while the Agribusiness Exemption applies only to impoundment structures used for agricultural purposes.