EPA radon potential
Zone 3Predicted average indoor screening level below 2 pCi/L. The designation is supported here by two agreeing secondary county tables because the EPA’s own Tennessee PDF could not be read directly during research. [4] [5]
01 / QUICK READ
Lower predicted potential. Almost no local evidence.
Test the home—not the county label.
Paris’s 2018 IRC adoption includes Appendix Q only, leaving radon Appendix F out. Henry County voted to opt out of statewide residential standards in 2022, but the outcome of another opt-out item considered in September 2026 is not publicly confirmed. [1] [2] [3]
Bottom line
Zone 3, a new-home label and “No Events” are not substitutes for a property-level test.
Zone 3, a new-home label and “No Events” are not substitutes for a property-level test.
02 / RISK & DATA
The dashboard contains no Henry County test events.
That is a data gap—not a measurement of low levels or evidence that the county has no radon.
COUNTY LABEL VERIFIED TWICE
Tennessee Radon Testing dashboard
No EventsAverage field
BlankMedian field
BlankMaximum field
On two separate loads, the tooltip itself read “County: Henry” and “Average Radon Level: No Events.” No county average, median, maximum or test count exists to publish from the 2022–2023 view. [6]
The lower charts are health-region aggregates—not Henry County counts.
The pre- and post-mitigation bands are labeled by health region. They cannot be used as Henry County test totals or percentages. The dashboard did show neighboring Stewart County at 2.7 pCi/L on one clearly labeled hover, but that value does not represent Henry County.
03 / BUILDING CODES
Paris leaves radon Appendix F out. The county’s current opt-out is not confirmed.
The practical result is no verified radon-resistant construction mandate anywhere reviewed—but the rural county status carries an open question.
2018 IRC · APPENDIX F OMITTED
City of Paris
Paris Municipal Code §4-101 adopts the 2018 IRC and related 2018 I-codes through Ordinance #1300, dated October 5, 2023. Section 4-102 separately adopts Appendix Q, the tiny-houses appendix. It does not adopt 2018 IRC Appendix F, “Radon Control Methods.” A full-code search returned no match for “radon.” [1] [9]
2026 OUTCOME UNCONFIRMED
Unincorporated Henry County
The County Commission voted to opt out of statewide building-code standards for one- and two-family dwellings on August 15, 2022. Another opt-out resolution appeared on the September 21, 2026 agenda, but the local follow-up did not report the outcome or resolution number. [2] [3]
STATE 2018 IRC · APPENDIX Q ONLY
Tennessee baseline
State Fire Marshal Rule 0780-02-23 adopts the 2018 IRC “and Appendix Q”. The radon appendix is not part of the state baseline. State enforcement therefore does not make radon-resistant construction mandatory where that baseline applies. [10] [11]
NO LOCAL RADON RULE FOUND
Schools, public buildings & sales
No Henry County or Paris rule was found requiring radon testing in public buildings, schools or real-estate transactions. Tennessee is classified as encouraging—not requiring—school radon testing, and a proposed annual school indoor-air program that included radon showed no evidence of passage. [12] [13]
How do I find a certified radon professional in Henry 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
Put radon inside the inspection contingency.
Tennessee’s standard disclosure covers known conditions. It does not require a seller to test, and its instructions advise buyers to consider a radon inspection contingency. [14]
A new home can still be an untested home.
Research found active 2025–2026 new construction in Paris and around Kentucky Lake. None of those locations is covered by a verified radon-resistant construction requirement: Paris omitted Appendix F, and unincorporated county enforcement is likely opted out but needs current confirmation.
Ask the builder whether a passive radon system was installed, request plans or installation photos, and test the completed home rather than assuming “new” means “radon-ready.”
Transaction plan
- Write radon testing into the inspection or due-diligence window.
- Book early; visible nationally certified options begin about 60 miles away.
- For a new build, 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 nationally certified measurement where available.
Request a free TDEC kit
Tennessee’s radon program provides free homeowner test kits. For time-sensitive real-estate testing, compare nationally certified providers and confirm current service areas.
Request a Tennessee radon kit →06 / FAQ
Questions Henry County homeowners ask
Is Henry County in a high-radon zone?
No. Henry County is mapped as EPA Zone 3, the lower-potential category with a predicted average indoor screening level below 2 pCi/L. Elevated homes can occur in every zone, so a home test is still the property-level answer.
What does Tennessee’s dashboard show for Henry County?
Two county-labeled checks showed “No Events.” The 2022–2023 dataset therefore supplies no Henry County average, median, maximum or test count to publish.
Does Paris require radon-resistant new construction?
No. Paris adopted the 2018 IRC through Ordinance #1300 and separately adopted Appendix Q. It did not adopt 2018 IRC Appendix F, the radon-control appendix.
What about new homes outside Paris?
Henry County voted to opt out of statewide residential standards in August 2022. Another opt-out item appeared on the September 21, 2026 agenda, but the outcome is unconfirmed. Verify current enforcement with the county or State Fire Marshal before relying on the opt-out for a project.
Are certified radon testers based in Henry County?
The October 2026 checks found no NRPP-listed professional based in the county and no NRSB measurement specialist within 50 miles of Paris. The nearest visible NRPP listings were about 60 miles away.
07 / SOURCES
Primary documents, public data & directories
- Paris Municipal Code, Title 4, Chapter 1 — 2018 I-code adoption and Appendix Q amendment.
- Henry County Commission report, August 15, 2022 — opt-out vote.
- September 21, 2026 commission agenda and September 22 follow-up — opt-out item and unreported outcome.
- EPA Map of Radon Zones: Tennessee — Henry County Zone 3.
- EPA Map of Radon Zones: Tennessee and EPA zone definitions.
- Tennessee Radon Testing dashboard — two live Henry County tooltip checks, October 15, 2026.
- NRPP Find a Professional — Paris ZIP 38242 search, October 15, 2026.
- NRSB Find a Pro — RMS, ZIP 38242, 50-mile search.
- American Legal code search — scoped Paris search returned no match for “radon.”
- Tennessee Rule 0780-02-23 — 2018 IRC and Appendix Q baseline.
- State Fire Marshal opt-out jurisdictions explainer and residential permits overview.
- Radon in Schools: review of state laws — Tennessee classified as “Encourage.”
- Tennessee HB1269 and HJR0696 — proposed testing language and “encourages” wording.
- Tennessee Residential Property Condition Disclosure instructions — known-condition framework and inspection-contingency guidance.
- TDEC free radon test-kit request — statewide homeowner program.
- EPA qualified-provider guidance — national proficiency programs.
Method note. This page separates verified findings from inference and open questions. “No Events” was published only after two matching county-labeled reads. Health-region bars are not presented as county statistics. Directory results are dated snapshots, not a census.