For Iowa Real Estate Agents
Iowa Realtor Radon Toolkit
Radon comes up in most Iowa transactions. Here is a clear reference on disclosure, the radon contingency, and how to keep a deal on schedule when a test comes back high, plus a one-page handout you can print for clients.
Radon and Iowa Disclosure
Iowa requires sellers to disclose known radon test results and known radon problems as part of the residential property condition disclosure. With roughly 71.6% of Iowa homes above the 4.0 pCi/L action level per Iowa HHS, and all 99 counties in EPA Radon Zone 1, radon is a routine part of Iowa real estate rather than an exception.
Many Iowa purchase agreements include a radon contingency that lets the buyer test and, if the result is at or above 4.0 pCi/L, negotiate mitigation before closing. Because results drive negotiation, accurate testing and clear documentation protect both sides and keep deals from stalling.
Two Iowa rules are worth knowing for your listings. Beginning July 1, 2026, new single-family and two-family homes must include a passive radon system under the state building code, and every Iowa public school must test for radon by July 1, 2027. Our guide to the Iowa school radon mandate (HF 2412) covers both, which is useful context for buyers asking about new construction and school-district safety.
What an Elevated Result Means for the Deal
An elevated result is rarely a deal-breaker. Mitigation is well understood and affordable relative to the transaction. According to published Iowa contractor pricing, a standard sub-slab system runs about $800 to $2,500, median near $1,400. Properly installed systems typically reduce radon by 50 to 99% according to the EPA, and a credentialed specialist re-tests to confirm. The key is timing: order the test early so there is room to mitigate and re-test before closing.
The 7 to 14 Day Closing-Timeline Playbook
- Days 1 to 2
Order the test
As soon as the inspection period opens, a credentialed specialist places a continuous monitor or short-term test.
- Days 3 to 5
Test runs
A short-term test runs two to seven days under closed-house conditions and results are read.
- Days 5 to 7
Negotiate if elevated
If the result is at or above 4.0 pCi/L, the parties negotiate who handles mitigation.
- Days 7 to 12
Mitigate
A credentialed specialist installs a system, often in about one day for a standard home.
- Days 12 to 14
Re-test and document
A post-mitigation test confirms the home is below 4.0 pCi/L and paperwork is provided for the file.
Client One-Pager
Radon and Your Iowa Home Sale
A quick guide for buyers and sellers, courtesy of Iowa Radon Professionals.
Iowa is high-radon. All 99 counties are EPA Radon Zone 1, the state average is around 8.5 pCi/L (Iowa HHS), and about 71.6% of homes test above the 4.0 pCi/L action level.
Test early. A short-term test runs two to seven days. Start it as soon as the inspection period opens.
Know the number. At or above 4.0 pCi/L, the EPA recommends mitigation. Below that, re-test periodically.
Mitigation is fast and affordable. Standard systems run about $800 to $2,500 per published Iowa pricing and install in about a day. Properly installed systems typically reduce radon 50 to 99% per the EPA, confirmed by a re-test.
Use a credentialed specialist. Work with an NRPP-certified, Iowa HHS-credentialed radon mitigation specialist who is licensed and insured and provides a written workmanship warranty.
Free quotes: (712) 000-0000 · iowaradonprofessionals.com
Iowa Radon Professionals is a marketing service operated by Compass Camper LLC and is not a contractor. All radon work is performed by independent licensed contractors.
Frequently Asked Questions
Does Iowa require radon disclosure in a sale?
Iowa requires sellers to disclose known radon test results and known radon concerns as part of the residential property disclosure. It does not require every home to be tested, but known results must be disclosed.
What is a radon contingency?
A radon contingency in a purchase agreement gives the buyer the right to test for radon and, if the result is at or above the 4.0 pCi/L action level, to negotiate mitigation or other remedies before closing.
Can mitigation happen before closing?
Often yes. A standard sub-slab system is typically installed in about one day, and a credentialed specialist can usually test, mitigate, and re-test within a 7 to 14 day window. Plan early in the inspection period.
Who pays for testing and mitigation?
It is negotiable between buyer and seller. Agents often advise testing early so there is time to negotiate without threatening the closing date.
Have a Client Who Needs Radon Help?
Send them our way or request a quote on their behalf. We connect Iowa buyers and sellers with credentialed specialists who work on transaction timelines.