Average pCi/L
Verified twice in the Fayette County tooltip on the 2022–2023 Tennessee dashboard.
The bottom line
The zone is regional. The test is personal.
EPA places Fayette County in Zone 3, where predicted average indoor radon is below 2 pCi/L. Yet the Tennessee dashboard reported a 2.3 pCi/L county average and a 1.3 median. Those figures describe submitted tests, not the next house on the block.
Median pCi/L
Also verified twice. The maximum could not be read and is withheld.
Certified pros based in-county
No NRPP-listed measurement professional was found in Fayette County.
Risk profile
A low-zone county with readings that still justify testing.
The EPA map estimates potential. The Tennessee dashboard summarizes submitted test events. Neither predicts a specific house.
Fayette County is EPA Radon Zone 3.
Zone 3 means low predicted potential, with average indoor levels projected below 2 pCi/L. EPA cautions that its map is for resource planning and building-code decisions—not for deciding whether a home should be tested.
Average reported by the state dashboard.
On two separate loads checked October 16, 2026, the tooltip identified “County: Fayette” and showed a 2.3 pCi/L average and a 1.3 pCi/L median. The maximum did not render clearly and is not published here.
Dashboard average
2.3 pCi/L
Average of submitted Fayette County tests; sample size is not shown.
EPA action level
4.0 pCi/L
A county average below this level does not clear an individual home.
The lower charts are West Region aggregates.
Selecting Fayette County filters the pre- and post-mitigation charts to “West Region,” not to the county itself. They cannot support a Fayette County test count or percentage above 4 pCi/L. The dashboard also does not state whether the tooltip summary combines pre- and post-mitigation results.
Building codes
Three enforcement paths. No confirmed local radon mandate.
The county, Oakland, Somerville, and Williston do not all follow the same enforcement path. Missing appendix records matter.
2018 International Codes referenced
- Fayette County operates its own Planning & Development permit and code-enforcement program.
- The permit portal links a handout about changes to the 2018 International Codes.
- The adopting resolution, effective date, and appendix list were not located; Appendix F adoption is unverified.
2021 ICC codes with local amendments
- Oakland’s site says it currently enforces the 2021 ICC codes.
- The adoption PDF exists, but its ordinance number, effective date, and appendix list could not be read.
- Whether 2021 IRC Appendix AF—the radon appendix—is adopted remains open.
State enforcement; 2018 IRC floor
- Williston appears on the State Fire Marshal’s state-permit-required city list.
- The statewide residential minimum is the 2018 IRC.
- The state’s adopted appendix list does not include the radon appendix.
Current code not verified
- Somerville is not on the state-permit-required municipal list, indicating a local program.
- No current code edition, adopting ordinance, or appendix list was found.
- No conclusion about radon-resistant construction should be drawn without confirmation.
The state did not adopt the 2018 IRC radon appendix.
Appendix F states that it is not mandatory unless an adopting ordinance specifically references it. Fayette County is also Zone 3; the appendix’s county table covers Zone 1 jurisdictions.
State adopted-code history ↗ · State code-enforcement notice ↗ · 2018 IRC Appendix F ↗
No Fayette-specific radon rule was found.
No county or municipal requirement surfaced for public buildings, schools, or real-estate transactions. Tennessee’s radon program is voluntary, and no Fayette County school-district testing policy was found. An unpublished policy could still exist.
For homebuyers
Treat the radon test as part of due diligence.
No Fayette County point-of-sale mandate was found. Tennessee’s disclosure form suggests a radon inspection contingency rather than requiring a current test.
Add radon to the inspection contingency.
The Tennessee disclosure form says buyers should consider a radon inspection contingency and makes clear that seller disclosures do not replace inspections.
Test a new home, too.
No local radon-resistant construction mandate was confirmed. Tennessee’s disclosure exemptions include new construction sold with a written warranty.
Ask the builder what was installed.
Request the permit jurisdiction, adopted code and appendix list, then ask whether a gas-permeable layer, vent pipe and fan-ready electrical provision were included.
Use the state program.
TDEC offers free radon test kits to Tennessee homeowners. The report’s state contact is TDEC.Radon@tn.gov or (615) 785-3289.
Housing context
Fast growth expands the testing opportunity.
Fayette County’s expanding housing stock makes new-construction testing especially important where code requirements remain uncertain.
45,071
2025 estimated population
Up 8.0% from the 2020 Census count of 41,990.
356
Building permits in 2025
A substantial flow of new homes entering a market without a confirmed local radon mandate.
$340,800
Median owner-occupied value
Housing investment raises the value of catching a correctable indoor-air issue.
81.4%
Owner-occupied housing
Free homeowner kits can reach a large share of the county’s residents.
How do I find a certified radon professional in Fayette 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
Fayette County radon FAQ
Is Fayette County in a high-radon area?
EPA classifies Fayette County as Zone 3, indicating low predicted potential. But elevated homes occur in every zone, and the state dashboard’s verified county average was 2.3 pCi/L. Only a test can determine a home’s level.
What did the Tennessee dashboard show?
On two checks on October 16, 2026, the tooltip identified Fayette County and showed an average of 2.3 pCi/L and a median of 1.3 pCi/L. The maximum could not be read and is not reported.
Is radon-resistant construction required?
No local radon appendix adoption was found. But the unincorporated county and Oakland appendix lists were not readable, and Somerville’s current code was not verified. Williston uses the state path, which does not adopt the 2018 IRC radon appendix.
Should a new home be tested?
Yes. No local radon-resistant construction mandate was confirmed, and a written-warranty new home may be exempt from Tennessee’s disclosure requirements. A test measures the house itself.
Are local certified testers available?
No NRPP-listed certified measurement professional was based in Fayette County on October 16, 2026. Five were based in Memphis, roughly 20 or more miles from Oakland. NRSB showed no measurement specialist in west Tennessee.
Can I get a free test kit?
TDEC’s voluntary radon program offers free kits to Tennessee homeowners. Order online or call the Tennessee Radon Program at 1-800-232-1139; you can also email TDEC.Radon@tn.gov.
Research trail
Primary and supporting sources
Dashboard, jurisdiction and professional-directory observations were checked October 16, 2026. Every unresolved record is identified above.
- TN State Fire Marshal adopted-code history — statewide 2018 IRC floor.
- TN State Fire Marshal: Apply for a Residential Permit — Williston listed; unincorporated Fayette, Oakland and Somerville absent.
- Fayette County Planning & Development — local permitting and code enforcement.
- Fayette County permit portal — 2018 International Codes handout.
- Town of Oakland Building & Code Enforcement — 2021 ICC codes with local amendments.
- Oakland 2021 code-adoption PDF — exists, but appendix details were unreadable.
- Tennessee Radon Testing dashboard — two verified Fayette tooltip observations.
- EPA Tennessee radon zone map and zone explainer.
- 2018 IRC Appendix F — radon-control scope and adoption language.
- NRPP professional directory — Oakland ZIP 38060 search snapshot.
- NRSB professional finder — Tennessee RMS directory snapshot.
- Tennessee Residential Property Condition Disclosure — inspection contingency and exemptions.
- U.S. Census QuickFacts: Fayette County — population, housing, home value and permit data.
- Radon in schools: state-law review — Tennessee categorized as encourage, not require.