EPA radon designation
1
Highest radon potential
Zone 1 means predicted average indoor screening levels above 4 pCi/L. It is a planning designation—not a substitute for testing a home.
Wilson County, Tennessee
Wilson County Radon
Wilson County, TN radon High radon potential. One city with a stronger code.
Wilson County sits in EPA Zone 1, yet only Lebanon’s published code clearly makes radon-resistant construction part of the local rulebook. In the rest of the county, the appendix question is still open.
Radon in Wilson County, Tennessee: quick answers
EPA zone: Zone 1Region: Middle TennesseeState test data: State test figures confirmed on repeat checks
Is radon a problem in Wilson County, Tennessee?
Yes, it can be. Wilson County is in EPA Zone 1, the highest radon-potential category, where the predicted average indoor screening level is above 4 pCi/L. Levels vary from house to house, so a test is the only way to know your home's level.
Do new homes in Wilson County, TN have to be built radon-resistant?
In Lebanon, yes: its 2018 code keeps the radon appendix (Appendix F). Unincorporated Wilson County and Mt. Juliet haven't published their appendix lists. Local code details
How do I test my home for radon in Wilson County?
Order a free short-term kit from the Tennessee Radon Program online or by calling 1-800-232-1139. Place it on the lowest lived-in floor, about 3 feet off the floor, for 3 to 5 days, then mail it back right away. How to test your home
What radon level means I should fix my home?
EPA recommends fixing your home if radon is 4 pCi/L or higher, and considering a fix between 2 and 4 pCi/L. Confirm a high short-term result with a second test first. What your result means
Who can test or fix radon in Wilson County?
Tennessee doesn't license radon professionals, so look for NRPP or NRSB certification. Search both national directories by ZIP code; certified professionals often serve Wilson County from nearby cities. How to choose a radon professional
01 / Risk snapshot
Moderate average, unmistakable high tail
The EPA designation describes countywide potential, not the result in any one house. Tennessee’s test dashboard shows why an address-specific test still matters.
2.5
Average pCi/L
0.9
Median pCi/L
9.5
Maximum pCi/L
Read the dashboard carefully.
Wilson County’s tooltip displayed all three values above in the 2022–2023 view. The lower pre- and post-mitigation charts are health-region aggregates, not county-level counts; Wilson is grouped into the Mid-Cumberland Region. No county test count or percentage above 4 pCi/L is claimed here.
Sources: Tennessee Radon Testing dashboard · EPA Map of Radon Zones
02 / Building codes
Lebanon is the confirmed exception
The four local code regimes do not tell the same story. Lebanon’s ordinance adopts the 2018 IRC and its appendices except a short exclusion list; Appendix F, Radon Control Methods, remains in force.
Wilson County
Unincorporated areas · 2021 IRC
Appendix status: unknown
The county page says “with adopted appendices” but does not publish the list, adoption resolution, or effective date.
Not confirmed
Mandatory vs. optional cannot be determined from the web record.
Lebanon
2018 IRC · Ord. #18-5619
Yes — Appendix F
The ordinance adopts the IRC “and its appendices” while excluding R313.2, 1102.4, Table N1102.1.2, and Appendix L. Radon Appendix F is not excluded.
Effectively mandatory
For new one- and two-family construction in this Zone 1 jurisdiction. Ordinance dated May 15, 2018.
Mt. Juliet
2018 IRC · Ord. 2018-33
Appendix status: unknown
The city publishes the adopted code edition, but its adoption ordinance is a scanned PDF whose appendix list could not be read.
Not confirmed
Ask whether 2018 IRC Appendix F was adopted.
Watertown
No published city code found
Applicable edition: unknown
Watertown’s published municipal code reserves Title 12. The county’s 2026 checklist routes building permits through Wilson County Building Codes.
Not confirmed
No city adoption or interlocal agreement was found online.
The local story: code certainty changes at the city line.
A new home in Lebanon has a published radon-control requirement. A new home elsewhere in Wilson County may or may not—the public record does not yet settle it. Testing remains the direct way to know the home’s level in every jurisdiction.
Sources: Lebanon Municipal Code, Title 12 · Wilson County Building Codes · Mt. Juliet Building & Codes · Watertown Municipal Code
03 / Buyer guidance
What to ask before closing
Wilson County’s growth and new-construction volume make one point especially important: a new house is not automatically a tested house.
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Test the address, not the ZIP code
Zone 1 and the 9.5 pCi/L dashboard maximum establish potential. Only a home test establishes the level in the property you are buying.
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In Lebanon, request the Appendix F record
For new construction, ask the builder for documentation of the passive radon-control system installed under the adopted 2018 IRC appendix.
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Elsewhere, do not assume the appendix applies
Appendix adoption remains unverified in unincorporated Wilson County, Mt. Juliet, and Watertown. Test new homes there too.
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Treat disclosure as history, not measurement
Tennessee’s form asks whether the seller knows of radon, but “Unknown” is permitted and sellers are not required to test. A buyer can request testing during the inspection contingency.
Sources: Tennessee REALTORS® RF 201 disclosure form · Tennessee disclosure overview
04 / Get help
Radon testing resources
Start with a home test. These public-health resources can help you get a kit, talk through the result, and find qualified help if the level is high.
Test your home
- Free test kit from TDEC, Tennessee’s radon program
- Buy a kit by phone: 1-800-SOS-RADON (1-800-767-7236)
- Live help with your questions: 1-800-55RADON (1-800-557-2366)
- Find a certified pro: NRPP 800-269-4174 · NRSB 866-329-3474
If your result comes back high
- 1-800-644-6999 — the Fix-It Hotline, for general guidance on lowering radon in your home
Learn more
Why it matters
- Radon causes about 21,000 U.S. lung cancer deaths a year — the second-leading cause overall and the number-one cause among people who never smoked.
- Smoking plus radon raises the risk roughly 10 times.
- About 1 in 15 homes has high radon.
- Retest at least every 2 years if you have a mitigation system, and after renovations or changes to how you use the lowest floor. EPA recommends taking action at 4 pCi/L and considering it between 2 and 4 pCi/L.
Hotline information: U.S. Environmental Protection Agency and Centers for Disease Control and Prevention. Health statistics: EPA, Health Risk of Radon and American Lung Association.
How do I find a certified radon professional in Wilson County?
Tennessee doesn't license radon testers or mitigators, so national certification is the best way to check qualifications. The Tennessee Radon Program points residents to two directories: search them by ZIP code and widen the radius if nothing is listed nearby.
We don't recommend or rank companies. Before you hire, check the certification number in the directory yourself and ask for a follow-up test after any system is installed. Questions to ask a radon professional.
05 / State baseline
No Wilson-only radon rule was found
Searches found no local rule for public buildings, schools, or real-estate transactions beyond Tennessee’s statewide framework. That is a research finding, not proof that no unpublished policy exists.
Schools
T.C.A. § 49-2-121 requires local education agencies to include radon testing in annual indoor-air-quality inspection and evaluation programs conducted between September 1 and December 31.
Read the bill textSeller disclosure
The statewide condition-disclosure form asks about known radon among environmental hazards. The response is based on the seller’s knowledge; the seller is not required to test.
View RF 201Free test kits
TDEC’s statewide indoor Radon Program offers free test kits to homeowners and publishes materials for buyers, professionals, contractors, code officials, and inspectors.
Request through TDEC06 / Source ledger
Primary links and corroborating records
Sources were reviewed on October 14, 2026. “Unknown” findings remain unknown where the public web record did not support a conclusion.
Building codes
Risk and testing
State rules and programs
Professional directories
Method note: this page distinguishes verified findings from unresolved appendix questions. The Tennessee dashboard tooltip values were read for Wilson County; the dashboard’s lower charts were verified as health-region, not county, aggregates. Professional-directory counts are snapshots, not a registry of every active tester.