EPA radon potential
Zone 3Predicted average indoor radon below 2 pCi/L. EPA says elevated homes have been found in all three zones and recommends testing every home. [5]
01 / QUICK READ
Low-potential map. No local radon construction rule.
Radon-resistant new construction is mandatory nowhere in Carroll County.
Unincorporated Carroll County has opted out of the state residential program. McKenzie is covered by the state’s 2018 IRC baseline, which adopts Appendix Q but not the radon appendix. Huntingdon’s published 2009 IRC adoption names no appendices. [1] [2] [3] [4]
Bottom line
Do not use Zone 3 or a new-home label as a substitute for testing.
Do not use Zone 3 or a new-home label as a substitute for testing.
Zone 3EPA low-potential designation: predicted county average below 2 pCi/L. [5]
No valuesCarroll’s dashboard median and maximum fields were blank on two county-labeled reads. [6]
0 nearbyNRPP listings within roughly 67 miles of Huntingdon. [7]
16Building permits in 2025: a market dominated by existing homes. [10]
02 / RISK & DATA
The county map is broad. The local dashboard is blank.
The public evidence supports a lower-potential classification, but not a Carroll County average, median, maximum or test count.
NO USABLE COUNTY NUMBERS
Tennessee Radon Testing dashboard
BlankMedian field
BlankMaximum field
On two full page loads, the tooltip’s own label confirmed “County: Carroll,” but the median and maximum values were blank. No numeric county value is published here. [6]
The lower charts are not Carroll County totals.
The pre- and post-mitigation bars are health-region aggregates. Their headings did not change after Carroll County was selected. No band count or percentage from those charts should be presented as a Carroll County statistic.
03 / BUILDING CODES
Three jurisdictions, the same practical result.
None of the reviewed local pathways makes an IRC radon appendix mandatory.
OPTED OUT
Unincorporated Carroll County
The State Fire Marshal’s current jurisdiction table lists Carroll County as OPT OUT. No county residential adopting ordinance was found. The practical result is no mandatory residential building code for new one- and two-family homes in unincorporated areas, so radon-resistant construction is voluntary. [2]
STATE PROGRAM · NO RADON APPENDIX
McKenzie
McKenzie’s Municipal Code Title 12 is reserved and defers residential provisions to state law. The state table marks the city SRBP, so the State Fire Marshal enforces Tennessee’s 2018 IRC plus Appendix Q. The radon appendix is not adopted. [1] [2] [3]
PUBLISHED CODE MAY BE STALE
Huntingdon
The published municipal code adopts the 2009 IRC through Ordinances #528 and #530. Unlike Huntingdon’s building-code chapter, the residential chapter does not adopt all appendices or enumerate Appendix F, so the radon appendix is not adopted. [4]
OTHER MUNICIPALITIES
State jurisdiction table
Atwood is listed as OPT OUT; Bruceton as EXEMPT; Clarksburg, Hollow Rock, McLemoresville and Trezevant as SRBP. [2]
No Carroll-specific radon rule was found.
No local mandate surfaced for public buildings, schools or real-estate transactions. Tennessee law encourages school indoor-air evaluations; it does not require school radon testing. [11]
How do I find a certified radon professional in Carroll 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.
04 / HOMEBUYERS
In Carroll County, the existing home is the main story.
The county recorded only 16 building permits in 2025, while 74.5% of occupied homes were owner-occupied. Most buyers will encounter existing housing, not new construction. [10]
A disclosure answer is not a radon test.
Tennessee’s property-condition form asks sellers whether they know of environmental hazards including radon gas and offers YES, NO or UNKNOWN. It also advises buyers to use inspection contingencies. Sellers are not required to test or remediate, and the form is not a warranty. [9]
Because no reviewed Carroll County jurisdiction requires a radon appendix, buyers cannot assume that a newer home contains passive radon features. Ask what was installed, then test the completed home.
Transaction plan
- Put radon testing inside the inspection or due-diligence window.
- Use an independent, nationally certified measurement professional where available.
- For a new home, ask for passive-system plans and installation photos.
- If mitigation is installed, retest to verify performance.
05 / TESTING RESOURCES
Start with Tennessee’s free test kit.
A do-it-yourself kit can screen a home. For a purchase or sale, use independent certified testing that fits the transaction timeline.
Request a free TDEC kit
Tennessee’s Radon Program offers one free home test kit per household, with laboratory analysis included.
Request a Tennessee radon kit →06 / FAQ
Questions Carroll County homeowners ask
Is Carroll County in a high-radon zone?
No. Carroll County is mapped as EPA Zone 3, the low-potential category with a predicted average indoor level below 2 pCi/L. EPA still recommends testing every home because elevated homes occur in every zone.
Does Carroll County require radon-resistant new construction?
No. Unincorporated Carroll County is listed as opted out of the state residential code program. McKenzie follows the state’s 2018 IRC baseline without the radon appendix, and Huntingdon’s published 2009 IRC adoption does not enumerate Appendix F.
What does the Tennessee dashboard show for Carroll County?
On two county-labeled checks, the median and maximum fields were blank. No usable county number is published here. The dashboard’s lower band charts are health-region aggregates, not Carroll County totals.
Are certified radon testers based near Carroll County?
The October 2026 directory checks found no NRPP-listed professional within roughly 67 miles of Huntingdon and no NRSB measurement professional within 50 miles. Verify current service areas and credentials before hiring.
Where can I get a radon test kit?
TDEC offers one free kit per household with laboratory analysis included. For a real-estate transaction, use an independent nationally certified measurement professional and fit the test inside your due-diligence period.
07 / SOURCES
Primary documents, public data & directories
- Tennessee Rule 0780-02-23 — state 2018 IRC baseline and Appendix Q.
- State Fire Marshal residential jurisdictions and inspectors — enforcement statuses, checked October 2026.
- McKenzie Municipal Code, Title 12 — reserved title and state-law deferral.
- Huntingdon Municipal Code, Title 12 — published 2009 IRC adoption.
- EPA Map of Radon Zones; county listing corroborated by EPA Map of Radon Zones: Tennessee.
- Tennessee Radon Testing dashboard — repeated Carroll County tooltip checks, October 2026.
- NRPP professional search — Huntingdon and Jackson ZIP searches, October 2026.
- NRSB Find a Professional — measurement searches near Huntingdon and Jackson.
- Tennessee Residential Property Condition Disclosure — radon question and contingency guidance.
- Census QuickFacts: Carroll County — population, housing, tenure, value and 2025 permits.
- Radon in Schools: review of state laws — Tennessee classified as “Encourage.”
- Tennessee HB1269 — proposed, unenacted school indoor-air language.
- TDEC free radon test-kit request — statewide homeowner program.
- EPA qualified-provider guidance — national proficiency programs.
Method note. This page separates verified local findings from inference and open questions. It publishes no Carroll County dashboard value because the county-labeled tooltip fields were blank. Health-region bars are not presented as county statistics. Directory results are dated snapshots, not a census.