Tennessee Radon Authority
Updated October 17, 2026

Lewis County Radon · Tennessee · Researched October 14, 2026

Lewis County, TN radon Zone 1. Zero recent state test records.

The absence of data is the story. Lewis County has the EPA’s highest radon-potential designation, yet Tennessee’s 2022–2023 dashboard shows “No Events.” Inside Hohenwald, the radon appendix is adopted. Outside city limits, the code answer is still open.

EPA potentialZone 1Highest predicted potential
State dashboardNo Events2022–2023 dataset
Hohenwald codeAppendix FAdopted in published code
Local certified pros0 based hereNRPP + NRSB live checks

Radon in Lewis County, Tennessee: quick answers

EPA zone: Zone 1Region: Middle TennesseeState test data: No 2022–2023 state test records for this county

Is radon a problem in Lewis County, Tennessee?

Yes, it can be. Lewis 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 Lewis County, TN have to be built radon-resistant?

In Hohenwald, yes: its published code includes the radon appendix (Appendix F). Unincorporated Lewis County has opted out of the state's residential building program, so no building code applies there. Local code details

How do I test my home for radon in Lewis 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 Lewis 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 Lewis County from nearby cities. How to choose a radon professional

No data is not no radon.

A live check of the Tennessee Radon Testing dashboard found “No Events” for Lewis County’s average, median and maximum. That means no tests in this state dataset—not a clean bill of health.

NO
EVENTS

What the dashboard actually says

State test figures that couldn't be confirmed on repeat checks aren't shown here. A missing figure doesn't mean radon is absent; test your home to know its level.

Tennessee Radon Testing dashboard

One county, two code stories.

Hohenwald’s published code answers the radon question. The unincorporated county does not—not yet.

Confirmed adoption

City of Hohenwald

The published municipal code adopts the 2012 International Residential Code with a long appendix list that expressly includes Appendix F, Radon Control Methods.

Because Lewis County is EPA Zone 1, the appendix makes radon-resistant new construction effectively mandatory in Hohenwald. The city’s listed amendments remove sprinkler provisions, not radon requirements.

Important caveat

A rolling-amendments clause allows later ICC changes to be adopted administratively, so confirm the edition currently enforced.

MTAS Hohenwald Title 12, §§12-301–304
Status unverified

Unincorporated Lewis County

Public web sources indicate the county has no building-and-codes department, but the county’s legal status could not be confirmed from an authoritative jurisdiction list.

If the State Fire Marshal enforces the statewide residential standards, the current state baseline is the 2021 IRC with no optional appendices. If the county opted out, no residential code applies in the unincorporated area.

Practical conclusion

Radon-resistant construction is not confirmed mandatory outside Hohenwald. Verify before relying on a builder’s or seller’s assumption.

MTAS opt-out mechanics

The buyer’s playbook.

Zone 1, an older housing stock and a blank recent state dataset all point to the same action: measure the home itself.

Test every home

Do not use the county’s “No Events” dashboard label as a proxy for indoor radon at a specific address.

Include new construction

Hohenwald’s code requires radon-resistant methods, but construction features do not replace a post-build radon test.

Ask outside the city

For an unincorporated property, confirm whether the State Fire Marshal or an opt-out governs the permit and inspection path.

Use the state program

TDEC offers free radon test kits to Tennessee homeowners. Availability and eligibility are handled on the state request page.

Request a free TDEC test kit ↗ Statewide program; follow the state page for current terms.

Radon testing resources.

Start with a test, know where to get help, and act on the result—not the county average.

Test your home

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 ~9×.
  • 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 Lewis 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.

Search NRPPSearch NRSB

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.

Lewis County radon FAQ

Direct answers to the questions raised by the county’s code, data and certified-tester findings.

Does Lewis County have recent state radon test records?

A live check of the Tennessee Radon Testing dashboard found “No Events” for Lewis County’s average, median and maximum. That means no tests in this state dataset—not a clean bill of health.

Is radon-resistant construction required in Lewis County?

Inside Hohenwald, the radon appendix is adopted. Outside city limits, the code answer is still open.

Are certified radon professionals based in Lewis County?

Live directory checks found no NRPP- or NRSB-certified radon professional based in Hohenwald or Lewis County. The nearest identified NRPP measurement professionals are outside the county.

Sources & limits.

Confirmed values are tied to the sources below. The dashboard and certification-directory findings were re-checked live on October 14, 2026.

  1. MTAS — Hohenwald Title 12: 2012 IRC adoption, Appendix F, amendments and rolling clause.
  2. EPA Map of Radon Zones: Tennessee and EPA Map of Radon Zones: Tennessee: Lewis County Zone 1.
  3. Tennessee Radon Testing dashboard: 2022–2023 “No Events” result; health-region band-chart labels.
  4. MTAS — residential code opt-out mechanics and code-adoption background.
  5. TDEC Radon Program: free test-kit request.
  6. World Population Review: county population and growth estimate, accessed October 14, 2026.
  7. City-Data — Hohenwald: 2024 population, income, housing-value and rural-status estimates.
  8. USPopulation — Hohenwald housing: directional age-of-housing-stock data.

Method note. “No Events” means no tests mapped to Lewis County in this dataset, not that radon is absent. No county test count or “percent above 4” is shown because the dashboard’s band charts are regional. The unincorporated county’s enforcement status and Hohenwald’s currently enforced edition remain open until confirmed by the responsible office.