The highest-potential category: predicted average indoor screening levels above 4 pCi/L.
Hamblen County radon · Tennessee
Hamblen County, TN radon Zone 1. New does not mean radon-ready.
Morristown’s radon appendix is optional or left to the Building Official. The unincorporated county’s appendix list is not readable online. For buyers across Hamblen County, the practical answer is the same: ask what was built, then test.
Cherokee Lake image: Wallace Real Estate
Radon in Hamblen County, Tennessee: quick answers
EPA zone: Zone 1Region: East TennesseeState test data: State test figures couldn't be confirmed, so they aren't shown
Is radon a problem in Hamblen County, Tennessee?
Yes, it can be. Hamblen County is in EPA Zone 1, the highest radon-potential category, where the predicted average indoor screening level is above 4 pCi/L. Levels vary from house to house, so a test is the only way to know your home's level.
Do new homes in Hamblen County, TN have to be built radon-resistant?
Only at the building official's discretion in Morristown, whose code makes the radon appendix "optional or required by the Building Official." Unincorporated Hamblen County's appendix list couldn't be confirmed. Local code details
How do I test my home for radon in Hamblen County?
Order a free short-term kit from the Tennessee Radon Program online or by calling 1-800-232-1139. Place it on the lowest lived-in floor, about 3 feet off the floor, for 3 to 5 days, then mail it back right away. How to test your home
What radon level means I should fix my home?
EPA recommends fixing your home if radon is 4 pCi/L or higher, and considering a fix between 2 and 4 pCi/L. Confirm a high short-term result with a second test first. What your result means
Who can test or fix radon in Hamblen County?
Tennessee doesn't license radon professionals, so look for NRPP or NRSB certification. Search both national directories by ZIP code; certified professionals often serve Hamblen County from nearby cities. How to choose a radon professional
Radon-control methods are optional or required only at the Building Official’s discretion.
No NRPP- or NRSB-listed measurement professional was based in Hamblen County.
01 / Risk & evidence
High potential, no verified county reading
EPA’s map places Hamblen County in Zone 1. Tennessee’s 2022–2023 dashboard would not yield a reliable Hamblen County tooltip after repeated attempts, so this guide publishes no county average, median or maximum.
The dashboard limit is the finding
About eleven hover attempts landed on Greene, Hawkins, Cocke, Jefferson and Washington counties instead. Each mis-hover was caught by the tooltip’s own county label and discarded.
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Hamblen readings withheldAverage, median and maximum were not verified. The workbook offers image, PDF and PowerPoint downloads—but no data export.
The pre- and post-mitigation charts aggregate by health region. Hamblen County is folded into the East Region; those bars are not county totals. Open the Tennessee dashboard.
Nearby counties show why testing matters
The same dashboard showed verified maximums of 7.9 pCi/L in Greene County, 26.6 in Cocke, 9.2 in Jefferson, 4.1 in Hawkins and 27.4 in Washington. Those are neighboring-county readings—not substitutes for Hamblen data or a test at your address.
02 / Building codes
Optional in the city. Unresolved outside it.
Both local governments enforce their own residential codes. Morristown’s rule is explicit; Hamblen County confirms the 2018 I-Codes but has not published a readable appendix schedule.
City enforcement
Morristown
City Building Inspections
2018 IRC
Code §12-301
Appendix F is adopted as “optional or required by the Building Official.” Radon-resistant new construction is discretionary—not a blanket requirement.
County enforcement
Unincorporated Hamblen County
County Building Inspections
2018 I-Codes
Adopted March 24, 2022
The resolution number, effective date and IRC appendix list were not verified online. The posted 17-page adoption PDF is scanned imagery; do not assume Appendix F applies.
State baseline
Tennessee standard
State Fire Marshal framework
2018 IRC
Effective July 16, 2020
The statewide standard adopts Appendix Q only, not Appendix F. Morristown and Hamblen County enforce their own residential codes rather than relying on state enforcement.
Morristown → Appendix F optional/discretionaryUnincorporated county → appendix status openState baseline → Appendix F excluded
Ask the jurisdiction—not just the builder
A new Morristown home may have a passive radon rough-in, but the city code does not make one universal. For an unincorporated address, request the March 24, 2022 adopting resolution and full appendix schedule.
Hamblen County Building Inspections lists 423-581-1373. See the county department page.
How do I find a certified radon professional in Hamblen 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.
03 / Homebuyer guide
The buyer has to put testing in motion
Tennessee sellers disclose radon they actually know about, but no state law requires a pre-listing test or mitigation at transfer. “Unknown” is not a low reading.
Add a radon contingency
The Tennessee Realtors disclosure form advises buyers to include one. Preserve enough inspection time for a valid test and follow-up if needed.
Do not rely on disclosure
The seller reports actual knowledge and may answer “Unknown.” Test regardless of the box checked, the neighborhood or the home’s age.
Verify new-build details
Ask for plans and inspections showing any sub-slab layer, soil-gas retarder and vent rough-in. Then test the completed, occupied home.
Act at 4 pCi/L
If a result is at or above 4 pCi/L, engage a certified mitigator and retest after the system is installed or activated.
04 / Quick answers
What the records establish
Clear answers where the documents are clear—and explicit limits where local records or dashboard data remain inaccessible.
Is Hamblen County a high-radon area?
Yes. EPA classifies Hamblen County as Zone 1, its highest-potential category, predicting average indoor screening levels above 4 pCi/L. That designation cannot predict an individual home’s reading.
Does Morristown require radon-resistant new construction?
Not across the board. Morristown’s 2018 IRC adoption includes Appendix F but says radon control methods are “optional or required by the Building Official.” Application is discretionary.
What about unincorporated Hamblen County?
The county confirms that its legislative body adopted the 2018 I-Codes on March 24, 2022. The resolution number, effective date and appendix list were not readable online, so Appendix F status is unresolved.
What county radon levels does Tennessee report?
This guide publishes none. Repeated attempts did not reliably isolate Hamblen County’s tooltip, and the workbook offers no CSV or spreadsheet export. The bar charts are East Region aggregates, not county totals.
Are there special local radon rules?
No Hamblen County- or Morristown-specific radon rules were found for public buildings, schools or real-estate transfers. Tennessee encourages school testing but does not mandate it; no passage status was verified for a 2018 proposal that would have changed that.
How many certified testers are local?
Directory searches found no NRPP- or NRSB-certified measurement professional based in Hamblen County. Nearby and Knoxville-area providers serve the market, and NRPP’s public list is opt-in rather than a complete census.