Checking what an existing radon report actually identifies
Understand how to interpret radon reports in Illinois property sales, focusing on verifying report validity and identifying key hazard disclosures.
The short answer
When reviewing an existing radon report, ensure it was generated by a professional currently licensed by the IEMA-OHS. A valid report should explicitly state testing conditions and methodology. Simply having a report in hand does not satisfy the legal requirement for disclosure; the information must accurately reflect the property's condition, and any known results must be shared with the buyer before the contract is signed.
Confirming Report Legitimacy
An existing radon report is only as reliable as the professional who produced it. Under the Radon Industry Licensing Act, testers must be licensed by IEMA-OHS. Check the report for a visible license number and cross-reference this with state records. If the report lacks professional certification, it should not be considered a valid indicator of the home's radon status.
Distinguishing Disclosure from Verification
Providing a report is part of the disclosure process, but it does not replace the mandatory Illinois Disclosure of Information on Radon Hazards form. A seller must provide both the formal disclosure document and any available historical reports. Relying only on a past report without verifying its contents against the current Illinois administrative code requirements is a common oversight.
Analyzing Report Methodology
Review the report for details on testing protocols, such as the duration of the test and the placement of equipment. The IEMA-OHS provides specific protocols for real estate transactions. If the report states that it did not follow these standard protocols, ask the professional who conducted the test to clarify how those deviations might impact the reliability of the findings.
Documenting Knowledge for Disclosures
Use this worksheet for your records: 1. Identify the testing date. 2. Record the professional’s IEMA-OHS license number. 3. List the test duration. 4. Note if the mitigation system was active or inactive during the test. Keeping this worksheet ensures that you have accurately captured the information required by the Residential Real Property Disclosure Act.
Checklist
- Confirm the report provider is licensed by IEMA-OHS.
- Check that the testing methodology matches current state protocols.
- Ensure the test was conducted within the subject property.
- Verify that the report date is current enough to be useful.
- Ask a qualified expert if the testing conditions listed on the report are standard.
Common questions
Does an old radon report count as an accurate disclosure?
You must disclose all actual knowledge regarding radon defects; consult a professional to determine if an outdated report provides enough current data.
Can I perform my own radon test for the disclosure?
Testing for real estate transactions typically requires an IEMA-OHS licensed professional; consult them regarding the validity of any self-performed testing.
Sources
- Illinois Residential Real Property Disclosure ActChecked October 12, 2026
- IEMA-OHS — Real estate radon guidanceChecked October 12, 2026
- EPA — Real estate lead-hazard disclosuresChecked October 12, 2026
- FEMA — Flood mapsChecked October 12, 2026
This guide is general educational content from SQFT IO, prepared with AI assistance. It is not legal, tax or loan advice. Talk with a licensed attorney, tax professional or lender about your situation. SQFT IO Illinois license 478.027617.