Radon Testing and Mitigation
VA Radon Testing Requirements: What the VA Does and Does Not Require
The VA does not require radon testing on home purchases — it is not a Minimum Property Requirement. However, radon causes approximately 21,000 lung cancer deaths per year in the U.S., and some lenders and states require testing in high-risk areas. A professional short-term test costs $150–$300 and takes 2–7 days. If levels exceed the EPA’s 4.0 pCi/L action threshold, mitigation runs $800–$1,500 and is negotiable with the seller.
Next step:
Check Your VA Loan Eligibility
VA Position
- Not required: Radon testing is not a VA Minimum Property Requirement — the appraiser will not test for it
- Lender overlays: Some lenders in high-radon states require testing as a condition of the loan
- Buyer protection: Testing during the inspection period gives negotiating leverage with the seller
Testing
- Cost: Professional short-term test costs $150–$300 and takes 2–7 days to complete
- Placement: Continuous monitor in the lowest livable level with 12 hours of closed-house conditions
- DIY alternative: Long-term DIY kits cost $25–$50 but take 90+ days — too slow for real estate
Mitigation
- Action level: EPA recommends mitigation at 4.0 pCi/L or above — the standard real estate threshold
- Cost: Sub-slab depressurization system costs $800–$1,500 for a typical single-family home
- Effectiveness: Standard mitigation reduces radon levels by 80–99%, typically below 2.0 pCi/L
High-Risk States
- EPA Zone 1: Iowa, Pennsylvania, Ohio, Minnesota, Colorado, and parts of the northern Midwest and Appalachia
- Disclosure required: Illinois, Colorado, Minnesota, and Pennsylvania require radon disclosure on residential sales
- Universal risk: Elevated radon has been found in every state — testing is the only way to know
Frequently Asked Questions
Does the VA require radon testing?
What radon level requires mitigation?
How much does radon mitigation cost?
The Bottom Line Up Front
The VA does not require radon testing on home purchases. However, radon is the second leading cause of lung cancer in the United States, and certain states, lenders, or local jurisdictions may require or strongly recommend testing as part of the transaction. If testing reveals radon levels above 4.0 pCi/L — the EPA’s action threshold — mitigation is recommended and some lenders require it before closing. Testing costs $150–$300. Mitigation costs $800–$1,500 for a standard sub-slab depressurization system. This is a buyer protection issue, not a VA mandate.
What Is Radon And Why Does It Matter?
Radon is a naturally occurring radioactive gas produced by the decay of uranium in soil and rock. It is colorless, odorless, and tasteless. It enters homes through cracks in foundations, gaps around pipes, and porous concrete. The EPA estimates that radon causes approximately 21,000 lung cancer deaths per year in the United States — making it the leading environmental cause of cancer death.
Radon levels vary widely by geography. The EPA divides the U.S. into three zones based on predicted indoor radon levels. Zone 1 (highest potential) includes much of the northern Midwest, Appalachian region, and parts of the Rocky Mountain states. But elevated radon has been found in every state — testing is the only way to know.
What Does The VA Actually Require?
The VA Lender’s Handbook does not list radon testing as a Minimum Property Requirement. The VA appraiser will not test for radon, will not note radon risk, and will not condition the loan on radon results. From the VA’s perspective, radon is outside the scope of the appraisal — unlike common appraisal dealbreakers — and the lender’s responsibility.
That said, some lenders add radon testing as an overlay — particularly in high-radon states like Iowa, Pennsylvania, Ohio, Minnesota, and Colorado. If the lender requires it, the borrower pays for the test and any resulting mitigation becomes a condition of the loan.
File Guidance
Even though the VA does not require radon testing, smart buyers in Zone 1 and Zone 2 areas should get tested as part of their home inspection. A $200 test can identify a $1,000 problem before closing — and if radon is found, the mitigation cost is almost always negotiable with the seller. Discovering radon after closing means you pay for everything out of pocket.
How Does Radon Testing Work?
There are two types of radon tests, but only one is practical for real estate transactions:
| Test Type | Duration | Cost | How It Works | Real Estate Use |
|---|---|---|---|---|
| Short-term (professional) | 2–7 days | $150–$300 | Continuous monitor in lowest livable area. Professional reads results. | Standard for transactions |
| Long-term (DIY kit) | 90+ days | $25–$50 | Alpha track detector mailed to lab for analysis. | Too slow for transactions |
For real estate transactions, a short-term professional test is standard. The tester places a continuous radon monitor in the lowest livable level of the home (usually the basement or ground floor) for 48–96 hours. Results are available within a day of retrieval. The test must follow EPA protocols — closed-house conditions for 12 hours before and during the test, no tampering with the monitor, and proper placement away from walls and windows.
- Closed-house conditions: All windows and exterior doors must remain closed for 12 hours before the test begins and throughout the testing period, except for normal entry and exit
- Placement: The monitor goes in the lowest livable area, at least 20 inches off the floor and away from exterior walls, sump pits, and HVAC vents
- Tampering prevention: Professional monitors include tamper indicators. If the monitor is moved or the house is opened during testing, the results may be invalidated
- Timing: Schedule the radon test during the inspection period so results are available before the inspection contingency expires
What Happens If Radon Is High?
If the test result exceeds 4.0 pCi/L, the EPA recommends mitigation. The most common fix is a sub-slab depressurization system: a pipe is drilled through the basement floor, connected to a fan that draws radon gas from beneath the foundation and vents it above the roofline. This system runs continuously and typically reduces radon levels by 80–99%.
- Mitigation cost: $800–$1,500 for a standard sub-slab system on a single-family home.
- Installation time: 4–8 hours for a professional install.
- Operating cost: The vent fan uses about $50–$75 of electricity per year.
- Post-mitigation test: A follow-up test 24–48 hours after installation confirms the system is working. Most systems bring levels below 2.0 pCi/L.
- Who pays: Negotiable between buyer and seller. In competitive markets, buyers may absorb the cost. In balanced markets, sellers typically handle it.
Process Watchpoint
If your lender requires radon testing and the results come back above 4.0 pCi/L, the mitigation must be completed before closing and a post-mitigation test must show acceptable levels before the lender will clear the file. Budget an additional 1–2 weeks for the mitigation, post-test, and results. Factor this into your closing timeline.
Which States Require Radon Testing Or Disclosure?
Several states have radon disclosure or testing requirements that affect real estate transactions regardless of the VA’s position:
| State | Requirement | Radon Risk Level |
|---|---|---|
| Illinois | Radon disclosure required on all residential sales | High — Zone 1 in most of state |
| Colorado | Radon disclosure required; many local lenders require testing | High — Zone 1 statewide |
| Minnesota | Radon disclosure required on all residential sales | High — Zone 1 statewide |
| Iowa | Radon testing strongly recommended by state law; some lenders require it | Highest in nation — Zone 1 statewide |
| Pennsylvania | Radon disclosure required; significant geographic variation | Mixed — Zone 1 in eastern/central counties |
| Ohio | No state requirement; lender overlays common | High in northern counties |
| Indiana | No state requirement; lender overlays common | High — Zone 1 in northern half |
| Nebraska | No state requirement; lender overlays common | High — Zone 1 statewide |
Should You Get Radon Testing Even If Not Required?
Yes, if you are in an EPA Zone 1 or Zone 2 area. The $150–$300 test cost is trivial compared to the health risk of long-term radon exposure. The EPA estimates that 1 in 15 U.S. homes has radon levels at or above the 4.0 pCi/L action level. If the home has a basement or crawlspace with direct soil contact, the risk increases.
Testing during the inspection period — just like lead paint inspections on pre-1978 homes — also gives you negotiating leverage. If radon comes back high, you can request the seller install a mitigation system as a condition of the sale — saving $800–$1,500 that would otherwise come out of your pocket after closing.
The Bottom Line
The VA does not require radon testing, but that does not mean you should skip it. Radon is a real health risk — the EPA’s 4.0 pCi/L action level is not arbitrary. Testing costs $150–$300 and takes 2–7 days. If levels are high, mitigation costs $800–$1,500 and solves the problem permanently. In high-radon states, some lenders require testing as an overlay. Whether or not your lender requires it, testing during the inspection period gives you negotiating power with the seller and protects your family after you move in.
