Seven of seven jurisdictions are listed as OPT OUT in the current SFMO table; Gruetli-Laager has a conflicting state record. SFMO ↗
Grundy County Radon · Tennessee
Grundy County, TN radon Low zone. No county code. Test the house.
Grundy County is classified in EPA Radon Zone 3. The State Fire Marshal’s current table lists all seven residential jurisdictions as opted out, although one conflicting state page leaves Gruetli-Laager’s status open.
Radon in Grundy County, Tennessee: quick answers
EPA zone: Zone 3Region: Middle TennesseeState test data: State test figures couldn't be confirmed, so they aren't shown
Is radon a problem in Grundy County, Tennessee?
It can be. Grundy County is in EPA Zone 3, the lowest predicted radon-potential category (below 2 pCi/L on average). Homes with high radon are still found in Zone 3, and the Tennessee Radon Program has found homes needing action in every Tennessee county, so test to know your home's level.
Do new homes in Grundy County, TN have to be built radon-resistant?
No. Unincorporated Grundy County and its towns are listed as opted out of residential codes, so radon-resistant construction isn't regulated. Gruetli-Laager's status is unconfirmed. Local code details
How do I test my home for radon in Grundy 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 Grundy 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 Grundy County from nearby cities. How to choose a radon professional
Low potential: predicted county average below 2 pCi/L. Elevated homes can still occur. EPA ↗
No NRPP- or NRSB-listed measurement professional is based in Grundy County. NRPP ↗
01 · Building codes
The county is opted out; one town is not confirmed.
Open a jurisdiction for the evidence and caveats.
The State Fire Marshal's current table lists unincorporated Grundy County and all six towns as OPT OUT. No local IRC adoption was found; however, a second state page conflicts on Gruetli-Laager, so that town’s status should be confirmed.
For the county and five towns with consistent records: radon-resistant new construction is not merely optional under an adopted code. It is unregulated. Gruetli-Laager needs direct confirmation before making the same claim there.
Grundy County, unincorporatedOpt out · no IRC found
The county is on the current OPT OUT list and is absent from the state-permit-required county list. The specific opt-out resolution number was not found online.
State permit list ↗AltamontOpt out · no IRC found
The county seat is listed as OPT OUT. No MTAS-codified municipal code or local residential code adoption was found.
SFMO table ↗Tracy CityOpt out · Title 12 reserved
Tracy City is listed as OPT OUT. Its municipal code reserves Title 12, “Building, Utility, etc. Codes,” for future use.
Municipal code ↗PalmerOpt out · no IRC found
Palmer is listed as OPT OUT and is not on the state-permit-required city list. No local residential code adoption was found.
SFMO table ↗CoalmontOpt out · no IRC found
Coalmont is listed as OPT OUT and is not on the state-permit-required city list. No local residential code adoption was found.
SFMO table ↗Beersheba SpringsOpt out · no IRC found
The SFMO table lists “Beersheeba Springs” as OPT OUT. The town is not on the state-permit-required list; no local residential code adoption was found.
SFMO table ↗Gruetli-LaagerStatus conflict · verify
The SFMO jurisdiction table says OPT OUT, but another SFMO page lists the city among places where a state residential permit is required. One page may be stale. Confirm with the State Fire Marshal before relying on this status.
SFMO table ↗State fallback still omits radon. Where Tennessee enforces a residential code, its minimum is the 2018 IRC plus Appendix Q only. The 2018 IRC radon appendix, Appendix F, is not adopted statewide. Rule 0780-02-23 ↗
02 · Radon evidence
Low regional potential is not a house result.
County-level signals, separated by confidence.
Grundy County is consistently classified as EPA Zone 3. That predicts a county average below 2 pCi/L; it does not tell you whether a particular house is below the EPA action level.
EPA radon potential
Zone 3
EPA says elevated homes have been found in all three zones. Its map is designed to help target resources—not to decide whether an individual home should be tested. Read the EPA guidance ↗
Corroborating estimate, not a replacement: a 2022 Tennessee disparity report estimated Grundy County's mean at 1.2 pCi/L, the lowest among Tennessee counties with at least 10 tests. This is consistent with Zone 3, but it is not the current state-dashboard value. 2022 report ↗
03 · For homebuyers
Make the test part of the deal.
Four practical consequences of the local rules.
The reviewed Tennessee disclosure form advises buyers to include a radon inspection contingency; the form itself does not mandate testing. No Grundy County-specific transaction rule was found.
Ask for the contingency
Put radon testing into the purchase contract rather than assuming the standard disclosure form requires a test.
Test new homes too
The consistent records show no radon-ready mandate in the county or five towns; Gruetli-Laager is not confirmed. “New” is not a test result.
Treat Zone 3 as context
A low county prediction cannot rule out a high reading in one house. Foundation type, construction, and ground contact are house-specific.
Plan for provider distance
No nationally credentialed measurement professional is based in the county. Ask about trip charges and scheduling before the inspection window gets tight.
Start with Tennessee's free test kit
TDEC's statewide radon program offers free kits to homeowners.
04 · Practical help
Radon testing resources
Testing, help lines, and next steps from trusted public-health sources.
Test your home
- Free test kit from TDEC, Tennessee’s radon program
- Buy a kit by phone: 1-800-SOS-RADON (1-800-767-7236)
- Live help with your questions: 1-800-55RADON (1-800-557-2366)
- Find a certified pro: NRPP 800-269-4174 · NRSB 866-329-3474
If your result comes back high
1-800-644-6999 — the Fix-It Hotline, for general guidance on lowering radon in your home.
Learn more
Why it matters
- Radon causes about 21,000 U.S. lung cancer deaths a year — the second-leading cause overall and the number-one cause among people who never smoked.
- Smoking plus radon raises the risk roughly ~9×.
- About 1 in 15 homes has high radon.
- Retest at least every 2 years if you have a mitigation system, and after renovations or changes to how you use the lowest floor. EPA recommends taking action at 4 pCi/L and considering it between 2 and 4 pCi/L.
Hotline information: U.S. Environmental Protection Agency and Centers for Disease Control and Prevention. Health statistics: American Lung Association.
How do I find a certified radon professional in Grundy 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.
Primary references
Source trail
Links used for the claims and caveats above.
TN State Fire Marshal — jurisdictions & inspectors
TN State Fire Marshal — residential permit lists
TN State Fire Marshal — residential code baseline
TN Rule 0780-02-23
Tracy City municipal code, Title 12
EPA Map of Radon Zones
Tennessee Radon Testing dashboard
Tennessee Radon Testing Disparity Report, 2022
NRPP Find a Professional
NRSB Find a Professional
EPA — finding a qualified provider
TDEC Radon Program
American Lung Association — Radon Basics
TREC property disclosure/disclaimer forms
U.S. Census QuickFacts — Grundy County