Radon When Selling or Buying a Home in Iowa

Iowa HHS states there is no state rule requiring radon testing or mitigation in a real estate transaction. A seller must, however, disclose any known radon tests (Iowa Code 543B.9 and 543B.18, Iowa Administrative Code 193E chapter 14). With 71.6% of homes above the EPA action level in the Iowa Radon Survey, many buyers ask for a test.

During the inspection period. A professional test with a continuous monitor typically runs at least 48 hours in closed-house conditions. HomeGuide lists professional tests at $125 to $400 (2026). See radon testing.

If the result is high. Buyer and seller can agree on a credit or on a system installed before closing; HomeGuide lists $1,200 to $2,000 for a typical mitigation system. Ask for a retest after installation and keep the report.

Basement water at the same time. Inspectors also note water stains, cracks and the sump pump. Fixing both at once is often cheaper. See planning water and radon together.

This article is general information, not legal advice; ask your real estate agent or attorney about your contract.