Not great, that’s how. Iowans pay the 11th-highest effective property tax rates in the country.
The table below from the Tax Foundation compares the mean effective property tax rates on owner-occupied housing (total real taxes paid/total home value) for all 50 states. The data does not include property taxes paid by businesses, renters, and others.

Take a look at Utah: they rank 43rd with the eighth-lowest effective property tax rate. Utah’s property taxes are not low solely because of their “Truth in Taxation” process, but their system of transparency definitely plays a role in keeping rates in check.