Radon Testing When Buying a Home in West Virginia: What Charles Town and Martinsburg Buyers Need to Know

What Is Radon and Why Does It Matter for Home Buyers in West Virginia?

West Virginia has a meaningful radon risk, but the statewide data is more precise than saying the state is among the highest-radon states. The American Lung Association reports that 28.5% of West Virginia radon test results were at or above the EPA action level of 4 picocuries per liter (pCi/L), placing West Virginia in the report's average tier nationally. That is roughly 1 in 3 test results, not 1 in 3 homes. If you're buying a home in Charles Town, Martinsburg, or elsewhere in the Eastern Panhandle, testing is a smart part of your due diligence.

By ERA Liberty Realty | October 6, 2026

Radon comes up in almost every home inspection conversation we have with buyers in this market. Some have heard of it. Many haven't. And almost none of them fully understand what a positive test result actually means for their purchase — or what they can do about it.

Here's what you need to know.

What Radon Is — and Why West Virginia Homes Are at Risk

Radon is a naturally occurring radioactive gas that forms when uranium in soil and rock breaks down underground. It seeps up through the ground, enters a home through foundation cracks, gaps around pipes, and slab joints, and then accumulates — especially in lower levels of the home.

You can't smell it, see it, or taste it. The only way to know it's there is to test for it.

28.5% of West Virginia radon test results were at or above the EPA action level in the American Lung Association's published state data. The statistic refers to test results, not a survey showing that 28.5% of all West Virginia homes have elevated radon.

The EPA action level is 4 pCi/L. EPA recommends fixing a home when a long-term test or the average of two short-term tests is 4 pCi/L or higher, and also recommends considering mitigation when levels are between 2 and 4 pCi/L. The estimated national average indoor radon level is about 1.3 pCi/L. Jefferson and Berkeley Counties are classified by the EPA as Zone 1 counties, meaning they have a predicted average indoor screening level greater than 4 pCi/L. That map is a screening tool, however, and individual homes can test higher or lower than the county-level prediction.

That doesn't mean every home has a problem. But it does mean that testing is not something you skip.

How Radon Testing Works During a Home Purchase

Radon testing typically happens as part of, or alongside, your home inspection. Here's how it works:

Short-term test: For a real estate transaction, EPA guidance allows short-term testing using passive devices or a continuous monitor for at least 48 hours. Testing should be conducted in an appropriate location according to the testing protocol, with steps taken to prevent or detect interference. In West Virginia, professional radon testing is regulated through state licensing requirements.

Who orders it: Your buyer's agent can help coordinate radon testing during the inspection period. West Virginia regulates radon testing through state licensing requirements, but radon testing is not a general requirement for every residential purchase. Don't assume the seller already has current results — ask for documentation and test the home if the radon history is unknown.

Cost: Testing costs vary by provider, device, timing, and whether the test is bundled with a home inspection. Ask for the testing fee before ordering. The cost of testing is generally small compared with the information it provides about a major purchase.

Timing: Results usually come back within a few days. Make sure your inspection contingency gives you enough time to receive radon results before you have to make decisions about the contract.

A note for buyers using VA loans

VA guidance recommends radon testing, but a radon test is not generally a VA loan requirement for an existing home. For proposed or new construction in EPA Radon Zone 1 areas, VA guidance includes requirements related to radon-resistant construction techniques where applicable. Because Jefferson and Berkeley Counties are EPA Zone 1, buyers of new construction should ask the builder about radon-resistant features and still test the home after completion.

Read more ERA Liberty Realty real estate articles.

What It Means If the Test Comes Back Elevated

First: don't panic. An elevated radon reading is a solvable problem — not a reason to walk away from a home you love.

Here are your options when radon comes back at or above 4 pCi/L:

Ask the seller to install a mitigation system before closing. A common mitigation approach is active sub-slab depressurization, which uses a pipe and fan to draw soil gas from beneath the home and vent it outdoors. EPA guidance says radon reduction systems can be highly effective, and its consumer guidance gives a general installation range of about $800–$2,500, although actual costs vary by home and system design. The goal is to reduce radon as much as reasonably possible, not simply to make the number disappear.

Negotiate a closing cost credit instead. If the seller does not want to complete the work before closing, the parties may negotiate a credit or another contractual solution, subject to the purchase contract and lender requirements. If you choose this route, get a quote from a properly licensed West Virginia radon professional so the requested amount is grounded in an actual scope of work.

Exercise your contractual rights if the issue cannot be resolved. If the radon level is elevated and the parties cannot agree on a solution, your options depend on the inspection contingency and other terms in your purchase contract. A buyer may have the right to terminate under the contract, but earnest-money treatment is contract-specific, so do not assume a refund is automatic. Your agent and, when appropriate, your attorney can help you understand the applicable terms.

Retest after mitigation. A follow-up test is an important way to verify that the mitigation system is working and radon levels have been reduced. In a purchase transaction, the timing and testing method should be coordinated with the contract, the mitigation professional, and the parties involved in the closing.

The Inspection Contingency — Your Protection Here

Whether radon testing and negotiation are covered, and what remedies are available, depends on the specific West Virginia purchase contract and its inspection provisions. Radon can be addressed during the inspection and due-diligence process, but buyers should review the actual contract deadlines and rights rather than assume every contract provides the same protections.

Make sure your contract includes enough time for both the initial radon test results and any follow-up negotiation. If the seller installs a mitigation system during the contingency period, you'll also want time for the post-mitigation test. A local agent who's handled radon situations in this market knows how to structure the timeline and the request so you're protected through the process — this is covered in more detail in our guide to what happens at closing in West Virginia.

Does a Radon Mitigation System Affect Resale Value?

One question buyers often ask: if I buy a home with a mitigation system already installed, is that a problem?

A mitigation system does not automatically make a home less desirable. What matters is whether the system is properly installed, operating as intended, and supported by current testing and maintenance documentation. If you sell a home with a mitigation system, keeping records of the installation and follow-up testing can help give the next buyer a clearer picture of the property's radon history.

What to Do If the Home Has Never Been Tested

This is more common than you'd think — especially in older homes or homes that have been in the same family for years. If the seller has no radon testing history, add radon testing to your inspection order. The WV Department of Health also provides free radon test kits for homeowners, though for a real estate transaction you want a certified professional test that meets EPA protocol, not a DIY kit.

If you're looking at new construction in the Charles Town area, ask the builder whether the home includes radon-resistant construction features. EPA guidance notes that passive radon-resistant systems can be designed so they can be activated with a fan if post-construction testing shows elevated levels. You can also read our guide to buying new construction in Charles Town, WV for more questions to ask during the process.

Reach out to ERA Liberty Realty today and let's talk through what the market looks like for you right now.

Frequently Asked Questions

Is radon testing required when buying a home in West Virginia?

No general West Virginia requirement makes radon testing mandatory in every residential real estate transaction. However, state law does regulate and license professional radon testers, and the West Virginia Department of Health encourages homeowners to test when preparing to buy or sell. Because 28.5% of West Virginia radon test results are at or above the EPA action level of 4 pCi/L, testing can be a valuable part of a buyer's due diligence.

What is the EPA action level for radon, and is it safe below that?

The EPA recommends fixing a home when a long-term test or the average of two short-term tests is 4 pCi/L or higher. EPA also recommends considering mitigation when levels are between 2 and 4 pCi/L. No level of radon exposure is considered completely risk-free. Radon is the second leading cause of lung cancer in the United States and the leading cause among people who have never smoked.

How much does radon mitigation cost in West Virginia?

EPA consumer guidance gives a general cost range of about $800 to $2,500 for radon reduction work, but actual costs vary based on the home, foundation, and mitigation method. In West Virginia, use a properly licensed radon mitigation professional and ask about the contractor's written scope, warranty, and follow-up testing.

Can I ask the seller to pay for radon mitigation?

Yes, a buyer can request that the seller install a mitigation system or negotiate another solution, such as a credit, but the seller is not automatically required to agree. The available options depend on the purchase contract, inspection contingency, lender requirements, and negotiations between the parties.

Does radon affect homes in Charles Town and Martinsburg specifically?

Jefferson County and Berkeley County are classified by the EPA as Zone 1, the highest-potential category on the EPA Radon Zones map. Zone 1 counties have a predicted average indoor screening level greater than 4 pCi/L. That designation does not predict the result for an individual house, so testing each property is still the only way to know its actual indoor radon level. EPA's supporting information also identifies limestone, carbonate soils, and karst terrain as factors that can contribute to radon potential in parts of the Eastern Panhandle.

About ERA Liberty Realty
ERA Liberty Realty is a local real estate brokerage serving the Eastern Panhandle of West Virginia, including Charles Town, Martinsburg, Harpers Ferry, Shepherdstown, Inwood, and surrounding communities. Our team helps buyers and sellers navigate the real estate process with local expertise and trusted guidance.

Explore more real estate articles from ERA Liberty Realty for additional guidance on buying, selling, inspections, closing, and life in the Eastern Panhandle.