4.6
pCi/L dashboard average
Above EPA’s 4.0 action level; test count not shown.
01
The county average hides a wide spread
These are the Tennessee Department of Health dashboard’s published Sevier County tooltip values for 2022–2023, with Year set to “All.”
Average4.6pCi/L
Median1.8pCi/L
Maximum13.5pCi/L
0 pCi/L8+ pCi/L
The 1.8 median and 4.6 average suggest a smaller group of high readings is pulling the mean upward. The dashboard did not show a county test count, and its pre/post-mitigation bars are East Region aggregates—not Sevier County counts. Treat these figures as the state program’s published values, not a prediction for any address. View the TN dashboard source.
Zone 2 does not mean “low risk.”
The EPA zone map is a 1993 planning tool. It predicts broad patterns, not individual homes; EPA advises testing homes in every zone. Read EPA’s map guidance.
02
One county, four code jurisdictions
A street address determines which code office governs the home. The adopted IRC edition is known; the radon appendix is not.
Unincorporated Sevier County
County Building Inspections
2024 IRC
Adopted-code list
Appendix BE: unverified
Sevierville
City code enforcement
2018 IRC
Applicable codes
Appendix F: unverified
Pigeon Forge
City Building Department
2024 IRC
January 2025 adoption document
Appendix BE: unverified
Gatlinburg
City Building & Planning
2018 IRC
March 2024 minutes
Appendix F: unverified
The question to ask before closing
“Which IRC edition and appendices governed this address, and was a passive radon system installed?” None of the four jurisdictions’ public records available in this review established whether the radon appendix was adopted. Do not let “built to code” stand in for a radon answer.
03
A practical buyer and cabin-owner playbook
Sevier’s tourism economy makes radon a primary-home, second-home, and short-term-rental issue.
Test during due diligence
Use a qualified measurement professional and preserve enough contingency time for follow-up testing or mitigation estimates. Tennessee’s standard REALTORS® disclosure form explicitly names radon, but a disclosure is not a test.
Verify the jurisdiction
Confirm whether the parcel is county, Sevierville, Pigeon Forge, or Gatlinburg. The four jurisdictions use two different IRC editions, and the appendix status remains open.
Inspect any “radon-ready” claim
Ask for plans, permit records, vent routing, slab or crawlspace details, and fan provisions. A passive pipe is not proof that indoor air is below 4.0 pCi/L.
Plan around rental rules
County STRU and city tourist-residency programs address safety and occupancy, but no Sevier-specific radon component was found. Treat radon testing as a separate health step.
1,139building permits in 2025
62,724housing units
101,3422025 population estimate
Population, housing-unit, and permit figures: U.S. Census Bureau QuickFacts. The Tennessee REALTORS® RF201 disclosure form names radon among environmental hazards and advises inspection contingencies; it is not a warranty. View the form.
How do I find a certified radon professional in Sevier 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.
Sources & verification notes
- Tennessee Department of Health, Tennessee Radon Testing dashboard — Sevier tooltip verified October 16, 2026; 2022–2023, Year “All.”
- EPA Map of Radon Zones: Tennessee and EPA Map of Radon Zones: Tennessee — both identify Sevier County as Zone 2.
- Sevier County Building Inspections; City of Sevierville codes; Pigeon Forge code adoptions; Gatlinburg commission minutes.
- NRPP Find-a-Pro search for ZIP 37862 — live directory review, October 16, 2026.
- U.S. Census Bureau QuickFacts, Sevier County — population, housing, and permits.
Research verified October 16, 2026. Open question: whether IRC Appendix BE/F is adopted in any local jurisdiction. The public documents reviewed did not expose a verifiable appendix list; confirmation requires the applicable code office.