Do I really need a radon test when buying a house in Iowa?

Yes, and Iowa is the easiest state in the country in which to justify that answer: Iowa has the highest average indoor radon in the nation, with the Iowa DNR estimating that roughly five in ten homes test above the EPA action level of 4.0 picocuries per liter. A coin flip is not the kind of odds you accept on a Class A carcinogen, and radon is exactly that, the leading cause of lung cancer among nonsmokers. The gas comes from uranium decaying in Iowa's glacial soils and enters through sump pits, slab cracks, and foundation joints; it is invisible, odorless, and completely undetectable without a measurement, and neighboring homes routinely test very differently, so no map or neighborhood anecdote substitutes for testing the actual house. The test itself is the least burdensome add-on we offer: we place a continuous monitor at the inspection, it runs for a minimum of 48 hours under closed-house conditions, and the result arrives shortly after your main report without delaying your timeline. If the number is elevated, mitigation is a routine, one-day, highly effective fix that Iowa buyers commonly negotiate into the deal, helped by the fact that Iowa law requires sellers to disclose known radon results. If the number is low, you have bought certainty cheaply. Add radon when you book; of every add-on on the Iowa menu, it is the one we would never skip on our own purchase.