Tennessee Radon Authority
Updated October 17, 2026

Hardin County radon · Savannah, Pickwick Lake & Tennessee River communities

Hardin County radon. Zone 2—and one thin public-data signal.

The state dashboard shows 1.8 pCi/L across every metric, likely reflecting a single test. No verified local code requires radon-resistant construction, including in new homes.

Research checked October 16, 2026Primary records and live directories
Editorial cutaway illustration of soil gas entering beneath a West Tennessee lake-region home
County-level potential and a sparse public dataset cannot predict the air inside a particular home.

Radon in Hardin County, Tennessee: quick answers

EPA zone: Zone 2Region: West TennesseeState test data: State test figures confirmed on repeat checks

Is radon a problem in Hardin County, Tennessee?

It can be. Hardin County is in EPA Zone 2, where the predicted average indoor screening level is 2 to 4 pCi/L. Homes above EPA's 4 pCi/L action level are found in every zone, so a test is the only way to know your home's level.

Do new homes in Hardin County, TN have to be built radon-resistant?

No. Unincorporated Hardin County appears opted out of state inspections, and Savannah's 2012 code adopts no residential appendices. Local code details

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

01 / QUICK READ

Moderate predicted potential, almost no county data, and no construction mandate.

Test every Hardin County home—including new construction.

The county appears outside state residential enforcement, and Savannah’s 2012 IRC adoption names no IRC appendices. The state dashboard’s 1.8 pCi/L reading is far too thin to stand in for a property-level test. [1] [2] [3]

Bottom line
A zone label, a new-home label and one likely test record are not substitutes for measuring the home.
Zone 2Moderate-potential designation: predicted average indoor levels of 2–4 pCi/L. [4]
1.8Average, median and maximum in the 2022–2023 dashboard view—all identical. [3]
0 localNRPP- or NRSB-listed measurement professionals based in Hardin County. [5] [6]
40+ miNearest visible national-directory options are outside the county. [5]
02 / RISK & DATA

Hardin County’s public sample appears exceptionally small.

All three summary metrics are identical. That is consistent with a single record—but the dashboard does not publish a county test count.

EPA radon potential
Zone 2

Predicted average indoor radon from 2 to 4 pCi/L. The designation is a broad planning category—not a property-level measurement. Neighboring Wayne County is Zone 1. [4]

COUNTY LABEL VERIFIED ON 2 LOADS

Tennessee Radon Testing dashboard

1.8Average · pCi/L
1.8Median · pCi/L
1.8Maximum · pCi/L

The tooltip itself read “County: Hardin” on two separate checks of the combined 2022–2023 view. Identical average, median and maximum values suggest one test record, but no count is shown and none is claimed. [3]

The lower charts are health-region aggregates—not Hardin County counts.

The pre- and post-mitigation charts remain grouped by health region. No regional total or percentage is presented here as county data.

03 / BUILDING CODES

No verified radon-resistant construction requirement anywhere in the county.

Rural Hardin County appears opted out of state residential inspections. Savannah adopted the 2012 IRC without naming any IRC appendices.

APPARENTLY OPTED OUT

Unincorporated Hardin County

An MTAS jurisdiction table lists Hardin County as “OPT OUT,” and the county’s live department directory names no building-code or inspection department. That means no enforced residential code—and no Appendix F radon mandate—was verified for unincorporated areas. [1] [7]

Important caveat: opt-out resolutions must be renewed after general elections. The current State Fire Marshal list was inaccessible during research, so confirm the county’s present status before a construction decision.
2012 IRC · NO IRC APPENDICES LISTED

City of Savannah

Savannah Municipal Code § 12-101 adopts the 2012 IRC but names no IRC appendices. Under IRC § R102.5, an appendix applies only when specifically adopted, so Appendix F for radon was not adopted. The same ordinance lists IBC appendices A, B, C, F, H, I and J; that IBC Appendix F concerns rodentproofing, not radon. [2] [8]

Adopting ordinance: Ord. #806-3-2015, April 2015. The municipal code was codified in June 2016; no later update was found, but the city recorder should confirm whether one exists.
STATE CONTEXT

Tennessee’s baseline

The state’s residential standard adopts the 2018 IRC “and Appendix Q.” It does not include Appendix F, the radon-control appendix. The rule took effect July 16, 2020. [9]

Even where a Tennessee jurisdiction separately adopts Appendix F, state amendments allow a capped attic vent until testing verifies 4 pCi/L or more and delete the power-source requirement at the termination.
NO LOCAL RULE FOUND

Schools, public buildings & sales

No Hardin County or Savannah-specific radon rule was found for schools, public buildings or real-estate transactions. Tennessee encourages, but does not require, school indoor-air evaluation that may include radon testing. The state disclosure form asks sellers about radon awareness and advises buyers to use inspection contingencies; it does not mandate a test. [10] [11]

A disclosure answer is not a measurement. Buyers should make a radon test part of their own due diligence.

How do I find a certified radon professional in Hardin 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.

04 / HOMEBUYERS

Pickwick buyers should not confuse “new” with “protected.”

No code path identified in this research requires radon-resistant construction, and Hardin County’s public data is too sparse to characterize an individual property.

Lake homes and build-later lots create a distinct testing case.

Pickwick-area listings reviewed in this research included new lake homes from $795,000 to $1.4 million and lake-access lots from $29,900 marketed for later construction. Out-of-area buyers and owners of second homes should schedule testing before travel and due-diligence windows close. [12] [13]

Hardin County had 26 building permits in 2025 and an estimated population of 27,983 in July 2025, up 3.8% from April 2020. New construction is modest, but each new home is still built without a verified local radon mandate. [14]

Transaction plan

  1. Write radon testing into the inspection or due-diligence window.
  2. Book early; certified providers appear to travel into the county.
  3. For a new build, ask whether passive radon features were installed voluntarily.
  4. For a second home, test under representative closed-house conditions.
  5. If mitigation is installed, retest to verify performance.
05 / TESTING RESOURCES

Start with Tennessee’s free-kit program.

A do-it-yourself kit can screen a home. For a time-sensitive purchase or sale, compare nationally certified providers and confirm travel terms first.

TDEC homeowner testing

Tennessee’s Radon Program offers free homeowner test kits and technical information for schools, real-estate professionals, contractors, code officials and inspectors.

Request a free Tennessee radon kit →
Search NRPPUse Savannah ZIP 38372 and confirm measurement credentialsSearch NRSBFilter for a Radon Measurement SpecialistView Tennessee’s dashboardHardin returned 1.8 / 1.8 / 1.8 pCi/L on two checksRead Savannah’s municipal codeTitle 12 contains the city’s 2012 IRC adoption
06 / FAQ

Questions Hardin County homeowners ask

Is Hardin County in a high-radon zone?

Hardin County is mapped as Zone 2, the moderate-potential category with predicted average indoor levels from 2 to 4 pCi/L. A zone cannot predict one home, so every home still needs a test.

What does Tennessee’s dashboard show for Hardin County?

Two county-labeled checks returned an average, median and maximum of 1.8 pCi/L in the combined 2022–2023 view. The identical values suggest one test record, but the dashboard shows no count—so this should be treated as a very thin signal.

Does unincorporated Hardin County require radon-resistant construction?

No verified mandate was found. Evidence indicates the county is opted out of state residential enforcement and has no local building-code department. Because opt-out status must be renewed, confirm the current status with the State Fire Marshal or county clerk before relying on it.

What about Savannah?

Savannah’s available municipal code adopts the 2012 IRC without listing any IRC appendices. That leaves Appendix F for radon unadopted, so radon-resistant construction is optional. Confirm that no post-2016 ordinance changed the code before a project.

Are certified radon testers based in Hardin County?

The October 2026 checks found no NRPP- or NRSB-listed measurement professional based in the county. The nearest visible NRPP listings were 40 miles away in Florence, Alabama, and 45.4 miles away in Lawrenceburg, Tennessee.

07 / SOURCES

Primary documents, public data & directories

  1. MTAS jurisdiction-status table — Hardin County listed as “OPT OUT”; historical evidence.
  2. Savannah Municipal Code, Title 12 — 2012 IRC adoption and ordinance history.
  3. Tennessee Radon Testing dashboard — two live Hardin County tooltip checks, October 16, 2026.
  4. EPA Map of Radon Zones: Tennessee; cross-check at EPA Map of Radon Zones: Tennessee.
  5. NRPP Find a Professional — Savannah ZIP 38372 search, October 16, 2026.
  6. NRSB Find a Professional — Savannah-area and statewide searches, October 16, 2026.
  7. Hardin County Government departments — live directory checked October 16, 2026; no building-code department listed.
  8. 2018 IRC Appendix F: Radon Control Methods — appendix identification and adoption context.
  9. Tennessee Rule 0780-02-23 — 2018 IRC and Appendix Q statewide adoption, effective July 16, 2020.
  10. T.C.A. § 49-2-121 — school indoor-air evaluation encouraged, not required.
  11. Tennessee Residential Property Condition Disclosure — seller awareness question and buyer contingency advice.
  12. Pickwick lake-access lots — “buy now, build later” market context.
  13. Pickwick-area lake-home listing — luxury new-construction context.
  14. U.S. Census QuickFacts: Hardin County — population, growth and 2025 permits.
  15. MTAS: 10 Simple Questions on Code Adoption — statewide residential-code context.
  16. Tennessee Radon Program — free homeowner test kits and technical resources.
  17. Knox County 2018 IRC amendments — Tennessee Appendix F amendment context.

Method note. This page separates historical opt-out evidence from current-status uncertainty, and the 2016 Savannah codification from any unlocated later ordinance. The dashboard figures are reported only after two county-label checks; the likely one-record interpretation is clearly labeled as an inference, not a verified count. Health-region bars are not presented as county statistics, and directory results are dated snapshots rather than a census.