Section 12-201 adopts the 2018 IRC with Appendices A–E, G, H, J, K, and M–Q. The skipped chapter is Appendix F, Radon Control Methods.
The countywide verdict
Testing is the reliable safety net. Crossville's code clearly omits the radon appendix; the unincorporated county uses the 2018 IRC, but its appendix list could not be verified. No special local radon rule was found.
The county's 2026 contractor packet confirms the code edition. It does not identify the adopting resolution or say which appendices were adopted.
EPA places the county in Zone 3, but the state dashboard recorded a maximum above 4 pCi/L and the two national directories showed no locally based measurement professional.
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“Zone 3” describes regional potential, not a guarantee for a house. The county dashboard's observed 7.0 pCi/L maximum is a direct reminder that an individual home can exceed the federal action level.
Four jurisdictions, different evidence
Filter the record by place. A red status reflects a clear exclusion; amber marks a finding that is not yet confirmed from the enforcing office.
Showing all four jurisdictions.
City of Crossville
Code §12-201 adopts the 2018 IRC through Ordinance 1647, dated September 14, 2021. Its appendix list includes A–E, G, H, J, K, and M–Q—excluding Appendix F. The publisher warns that the online code may trail the latest legislation.
RRNC not requiredUnincorporated Cumberland County
The county's Contractor Information Packet, revised October 1, 2026, says the Building Codes & Inspection Department enforces the 2018 IRC. The adopting resolution, effective date, and appendix list were not located.
Appendix F unverifiedTown of Pleasant Hill
The available MTAS municipal code is an old 1992 code, updated through 2004, with no IRC chapter. A circa-2011 status table calls the town exempt from state residential permitting. Current local enforcement was not verified.
Current code unverifiedTown of Crab Orchard
No local IRC adoption was found. A circa-2011 MTAS status document places Crab Orchard in the State Residential Building Permit program. If that status still holds, the state—not the town—handles residential permits, and optional appendix provisions are not adopted.
Program status needs update
Close the county's biggest code gap
For unincorporated Cumberland County's 2018 IRC adoption, which appendix chapters were adopted—specifically, was Appendix F, Radon Control Methods, included?
Tennessee dashboard · Cumberland County
2.3
average pCi/L
Low-potential zone, measured exceptions
- EPA Zone 3The county is in the low-potential category, associated with a predicted average indoor screening level below 2 pCi/L. Neighboring Roane County is Zone 1.
- Average 2.3; maximum 7.0 pCi/LThe Tennessee dashboard showed both figures identically on two verified loads with the 2022–2023 “All” filter. The median field was blank.
- Unknown sample depthThe tooltip exposes no test count. Nearby counties produced volatile hover values, so neither 2.3 nor 7.0 should be treated as a precise picture of every Cumberland County home.
- Regional charts are not county countsThe dashboard's pre- and post-mitigation bands are health-region aggregates. They do not become Cumberland-only results when the county is selected.
Open the Tennessee Radon Testing dashboard · See EPA's radon-zone guidance
How do I find a certified radon professional in Cumberland 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.
What buyers and builders should do
Fairfield Glade and the wider county attract out-of-state retirees and continue to add homes. Neither a new-build label nor a Zone 3 map color answers the only question that matters: what does this house measure?
Before contract
Reserve time for a test
No locally based certified tester appeared in either national directory. If professional measurement is part of the inspection contingency, schedule early enough to accommodate travel from Sparta, Oak Ridge, or Knoxville.
During due diligence
Measure the actual home
The standard Tennessee disclosure asks whether a seller knows of hazards such as radon gas. It is awareness-based and does not replace a test of the property being purchased.
For a new build
Specify radon features directly
Crossville does not require Appendix F. The unincorporated county's appendix list is unverified. Put any passive system, vent path, sealing, fan-ready wiring, and post-construction test into the project scope rather than assuming code includes them.
After results
Use the measured level
The dashboard's 7.0 pCi/L maximum is above the 4.0 pCi/L action level. A county average of 2.3 cannot clear an individual house.
Why this matters in Fairfield Glade: a 2025 Marketplace report described roughly 9,500 residents, about 70% age 65 or older, and continuing build-out. Buyers arriving from other states may be used to different radon and disclosure practices.
Start with a measurement
These links come directly from the research record. Verify directory credentials and current jurisdiction rules before relying on them for a transaction or construction decision.
Request a free Tennessee kit
TDEC Radon ProgramTennessee offers free homeowner test kits statewide. The program number listed in the research is 800-232-1139.
Find a certified professional
NRPP directory · NRSB directorySearch by the home's ZIP code and confirm that the credential covers measurement—not only mitigation.
Check the building-code record
County contractor packetFor the missing appendix list, contact Cumberland County Building Codes & Inspection at 931-710-5727.