Schools
Tennessee law encourages local education agencies to create indoor-air-quality programs that may include radon testing. It does not require the testing.6
The county picture
A zone boundary is not a safety line.
Carter County is EPA Zone 2, while neighboring Washington and Sullivan counties are Zone 1.8 Elizabethton’s latest public code record adopts the 2015 IRC with Appendix H only—not Appendix F, that edition’s radon appendix.3 Unincorporated Carter County runs its own inspection program, but its current code edition and appendix list could not be verified online.15
Radon risk profile
EPA Zone
2
Zone 2 is EPA’s moderate-potential category, associated with predicted average indoor screening levels of 2–4 pCi/L.8 It is a planning signal—not a measurement for any address.
No defensible county number came out of the state dashboard.
!County tooltip withheld
The Tennessee Radon Testing map covers 2022–2023, but Carter County’s average, median and maximum could not be verified from a county-labeled tooltip.9
No tooltip value is published here as Carter County’s. The pre- and post-mitigation charts aggregate by Northeast Region rather than the selected county.
2022–23Years shown in the dashboard view
NortheastRegion used by the band charts
0County tooltip values safe to publish
Public rules & transactions
No special local radon regime was found
The reviewed sources showed no Carter County- or Elizabethton-specific rule for public buildings, schools or residential sales beyond Tennessee’s statewide framework.
Home sales
The statewide form covers known environmental hazards including radon and advises buyers to consider a radon inspection contingency. Sellers are not required to test or repair.7
New construction
New construction sold with a written warranty is exempt from Tennessee’s disclosure requirement. That makes a direct builder question—and an independent test—especially important.7
How do I find a certified radon professional in Carter 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.
Homebuyer guidance
Test the home, not the zone.
Carter County’s market gives buyers reasons to make radon part of due diligence—without treating countywide context as a substitute for a property-specific measurement.
01
Do not assume “new” means radon-ready
About 190 building permits were reported for 2025, yet Elizabethton’s latest public code does not adopt the radon appendix and the county status is unverified.12
02
Use the inspection contingency
Roughly 60 median days on market and about 411–417 active county listings were reported in the reviewed market snapshot. Timing varies, so negotiate the testing window in writing.13
03
Give older homes equal attention
The county’s 2020–2024 Census profile reports a $168,200 median owner-occupied value and 75.2% owner occupancy. Age, foundation type and location do not remove the need to test.12
A moderate-zone county can still contain elevated homes. Carter County had an estimated 57,361 residents and 28,715 housing units in the cited Census profile. Mountain relocation buyers and second-home shoppers should not infer a property’s radon level from scenery, price, county average or neighboring zones.12
Questions answered
Carter County radon FAQ
Short answers grounded in the EPA zone record, local code documents, the state dashboard review and current certification directories.
Carter County is EPA Radon Zone 2, the moderate-potential category associated with predicted average indoor levels of 2–4 pCi/L. A zone cannot predict the reading in an individual home; every home should be tested.
Not under the latest public record found. Elizabethton adopts the 2015 IRC with Appendix H only, so Appendix F—the radon appendix—is not part of that adoption. Because the MTAS code copy may lag, verify the current edition directly with the city.
The county runs its own permit and inspection program, but its current IRC edition, appendix list, adopting resolution and effective date could not be verified online. Contact Carter County Building Inspections before relying on a code assumption.
The state dashboard’s Carter County tooltip could not be verified through a county-labeled result. Its pre- and post-mitigation charts show Northeast Region aggregates, so no Carter County average, median, maximum or test count is published here.
No. Tennessee’s disclosure framework covers known environmental hazards including radon, but sellers are not required to test or repair. Buyers should negotiate an appropriate inspection contingency.
Source ledger
Read the record
Official sources establish the local code and state framework. Dashboard and professional-directory observations are dated snapshots reviewed October 16, 2026.
- Tennessee SFMO Residential Jurisdictions & Inspectors — Elizabethton and Carter County listed as exempt from state residential enforcement.
- Tennessee SFMO Residential Permits — counties served by the state program and statewide code context.
- Elizabethton Municipal Code, Title 12 — 2015 IRC, Appendix H only, and adoption history.
- Tennessee Rule 0780-02-23 — state-program adoption of the 2018 IRC with Appendix Q.
- Carter County Planning & Zoning — county permits, inspections and contact details.
- T.C.A. §49-2-121 — school indoor-air-quality programs may include radon testing.
- Tennessee Residential Property Condition Disclosure — known radon hazards and inspection-contingency guidance.
- EPA radon zones data — Carter County Zone 2 and neighboring county designations.
- Tennessee Radon Testing dashboard — 2022–2023 county map and Northeast Region band charts.
- NRPP professional directory — Carter County and nearby listings reviewed from ZIP 37643.
- NRSB Find a Professional — no reviewed measurement listing within 25 miles of 37643.
- Census QuickFacts, Carter County — population, housing, ownership, value and permit context.
- Realtor.com Carter County market page — active-listing and days-on-market snapshot.
- Movoto Elizabethton market trends — 2026 list-price context.