EPA predicted potential
Predicted average indoor radon below 2 pCi/L. A zone cannot predict a particular home.
The bottom line
Low predicted potential does not replace a test.
EPA places Hardeman County in Zone 3, where predicted average indoor radon is below 2 pCi/L. Yet the Tennessee dashboard offers no local 2022–2023 measurements at all. The useful number is the reading from the house itself.
State dashboard, 2022–2023
The county-labeled tooltip showed no recorded tests on two separate checks.
Certified pros based in-county
No NRPP- or NRSB-listed measurement professional was found based in Hardeman County.
Risk profile
A low-zone county with almost no local evidence.
The EPA map estimates potential. The Tennessee dashboard reports submitted test events. Neither can determine a specific home’s result.
Hardeman County is EPA Radon Zone 3.
Zone 3 means predicted average indoor screening levels below 2 pCi/L. EPA notes that elevated homes occur in every zone and recommends testing every home.
Zero tests recorded in the 2022–2023 dashboard.
On two separate loads checked October 16, 2026, the tooltip identified “County: Hardeman” and displayed “Average Radon Level: No Events.” Median and maximum were blank.
The lower charts are regional, not county counts.
Selecting Hardeman County did not change the pre- and post-mitigation band charts; they remained health-region aggregates. Those charts cannot support a Hardeman County test count or percentage above 4 pCi/L.
The absence of tests fits a broader testing gap.
A 2022 Tennessee disparity report identified Hardeman as the state’s lowest-testing county, at fewer than one test per 1,000 housing units. That supports the “untested” framing, not a claim of low household risk.
Building codes
The county answer is clear. Bolivar is not confirmed.
Unincorporated areas use state residential enforcement. Bolivar appears to enforce its own code, but the available city copy is old.
2018 IRC; Appendix F not adopted
- Hardeman County is listed among counties where a state residential permit is required.
- Rule 0780-02-23 adopts the 2018 IRC and Appendix Q, effective July 16, 2020.
- Appendix F—the radon appendix—is not adopted, so radon-resistant construction is optional.
Available copy says 2012 IRC + all appendices
- Bolivar is absent from the state-permit-required municipal list, indicating local enforcement.
- The MTAS code copy adopts the 2012 IRC “and all appendix and reference standards,” nominally including Appendix F.
- The copy is marked through January 2018; the adopting ordinance and current code edition were not verified.
State enforcement applies in unincorporated Hardeman County.
The State Fire Marshal’s permit page lists Hardeman County, while the program page identifies the 2018 IRC. The governing rule adopts only Appendix Q and excludes optional or recommended practices.
State permit jurisdiction list ↗ · Residential permit program ↗ · Rule 0780-02-23 ↗
The available municipal code may be stale.
The 2012 edition is older than the seven-year currency window for locally enforced residential codes, and the MTAS copy warns that later ordinances may be missing. Confirm the current IRC edition and whether Appendix F is enforced directly with the City of Bolivar.
No Hardeman County- or Bolivar-specific radon rule was found.
No local rule surfaced for schools, public buildings, or real-estate transactions. Tennessee law encourages—not requires—school indoor-air evaluation that includes radon. This web search does not prove that no unpublished policy exists.
For homebuyers
Make the test part of the inspection window.
No Hardeman County-specific point-of-sale rule was found. Tennessee disclosure practice centers on known conditions, not mandatory testing.
Add a radon inspection contingency.
Tennessee’s residential disclosure form advises buyers to include radon among inspection contingencies. A seller’s disclosure of known conditions is not a current measurement.
Test older homes, even in Zone 3.
Hardeman County’s housing market is primarily existing-home resale. With no recorded 2022–2023 dashboard tests, local averages cannot clear an address.
Ask what a new build actually includes.
Unincorporated county rules do not require the radon appendix. Bolivar’s status is unresolved. Ask the builder whether radon-resistant features were installed.
Use the state’s free-kit program.
TDEC offers free radon test kits to Tennessee homeowners. Check the program page for current availability and instructions.
Housing context
A rural resale market, not a building boom.
The intervention point is often the inspection period on an older existing home, not code compliance on a new subdivision.
25,274
2025 estimated population
U.S. Census QuickFacts estimated a 0.7% decline from April 2020.
34
Building permits in 2025
Only a small amount of new construction entered the county market.
$121,700
Median owner-occupied home value
The county is a comparatively low-cost housing market.
71.7%
Owner-occupied housing
Free homeowner kits can be a practical first step for much of the local market.
How do I find a certified radon professional in Hardeman 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.
Answers in brief
Hardeman County radon FAQ
Is Hardeman County in a high-radon area?
No. EPA classifies Hardeman County as Zone 3, indicating predicted average indoor radon below 2 pCi/L. But elevated homes occur in every zone; only a test can determine a home’s level.
What did the Tennessee dashboard show?
On two checks on October 16, 2026, the Hardeman County tooltip showed “No Events” for the 2022–2023 dataset. That means no tests were recorded in the dashboard, not that homes had no radon.
Is radon-resistant construction required in unincorporated Hardeman County?
No. The state enforcement program uses the 2018 IRC and adopts Appendix Q only. Appendix F, the radon appendix, is not adopted.
What about Bolivar?
The available city code copy adopts the 2012 IRC and all appendices, nominally including Appendix F. But the copy may be stale and the current edition and enforcement could not be verified. Confirm directly with the city.
Is a radon test required when a home is sold?
No local testing mandate was found. Tennessee sellers disclose known radon conditions; buyers can make radon testing part of the inspection contingency.
Are local certified testers available?
No NRPP- or NRSB-certified measurement professional was found based in Hardeman County on October 16, 2026. The nearest NRPP listings began about 46 miles away in Memphis.
Research trail
Primary and supporting sources
Dashboard, jurisdiction, and professional-directory observations were checked October 16, 2026. Source limits are carried into the findings above.
- TN State Fire Marshal: Apply for a Residential Permit — Hardeman County listed; Bolivar absent.
- TN State Fire Marshal residential program — 2018 IRC baseline.
- Rule 0780-02-23 — 2018 IRC + Appendix Q, effective July 16, 2020.
- Bolivar Municipal Code, Title 12 — available 2012 IRC adoption language; change note January 2018.
- Tennessee Radon Testing dashboard — two verified Hardeman tooltip observations.
- EPA Tennessee radon zone map and zone definitions.
- Tennessee radon testing disparity report — lowest-testing-rate context.
- NRPP ZIP 38008 search — distance-ranked directory snapshot.
- NRSB professional finder — 100-mile measurement-specialist search.
- Tennessee Residential Property Condition Disclosure, RF 201 — known-condition disclosure and buyer inspection guidance.
- U.S. Census QuickFacts: Hardeman County — population, housing, home value, and permit data.
- Tennessee Department of Environment and Conservation — state radon program and free homeowner kits.