A radon resource by Air Sense Environmental
Air Sense EnvironmentalSt. Louis Home Radon Test
St. Louis Home Radon Test / Air Sense

Radon One-Pager for Home Buyers and Sellers: Missouri and Illinois

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Agents and inspectors can share this page or print the one-pager for clients. There is a Missouri version and an Illinois version, because the two states treat radon in home sales differently. Each covers what radon is, how a real estate radon test works, what the 4.0 pCi/L action level means and what to do next.

Sealed sump cover with radon suction piping
Real Air Sense installation photography.
01 Understand the result02 Discuss the property03 Plan the next step

Download the radon one-pager

Each PDF is a single page with Air Sense Environmental contact details. Nothing else is expected from you or your client.

What should every buyer and seller know about radon?

  • Radon is a natural radioactive gas from soil and rock with no color or smell. A test is the only way to know the level in a specific house.
  • EPA recommends fixing a home at 4.0 pCi/L or higher and considering a fix between 2 and 4 pCi/L.
  • A real estate test is placed on the lowest level that is used, or could be used, as living space.
  • Short-term transaction testing commonly requires at least 48 hours of measurement under closed-house conditions.
  • A mitigation system is not a test result. Ask for the post-mitigation test report.

What applies to a Missouri home sale?

Missouri DHSS states that Missouri has no regulations requiring radon testing. In a Missouri sale, testing depends on the buyer, the purchase agreement and any lender condition. EPA recommends testing before buying a home.

  • Order the test early in the inspection period.
  • Share the test instructions with occupants and showing contacts.
  • Put any repair, credit or retest terms in writing.

What applies to an Illinois home sale?

Under the Illinois Radon Awareness Act, the seller of residential property gives the buyer the IEMA-OHS pamphlet "Radon Testing Guidelines for Real Estate Transactions" and the Illinois Disclosure of Information on Radon Hazards. The disclosure is not a test result. Illinois requires radon testing and mitigation to be performed by professionals licensed by IEMA-OHS.

  • Ask for the disclosure and any earlier radon report.
  • Confirm the tester holds an IEMA-OHS license.
  • Put any repair, credit or retest terms in writing.

Who can you call about a radon result?

Air Sense Environmental arranges radon testing, performed by an IEMA-licensed radon measurement professional, and designs and installs mitigation systems. Owner Jake Lusby holds Illinois IEMA Mitigation Professional license RNM20232346. Call 314-664-9807, or see how Air Sense works with agents and inspectors.

Your next step

Make a plan for your property.

Ask Air Sense Environmental about testing, system options or an existing radon concern.

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