Tennessee Radon Authority
Updated October 17, 2026

Decatur County radon · Decaturville, Parsons, Scotts Hill & river communities

Decatur County radon. Zone 2 potential—and no tests in the state dataset.

No part of Decatur County has a verified radon-resistant construction mandate. Unincorporated areas are outside state residential enforcement; the three cities use a state code that omits the radon appendix.

Research checked October 16, 2026Primary records and live directories
Editorial cutaway illustration of radon moving through soil and foundation openings beneath a West Tennessee home near the Tennessee River
A Zone 2 label predicts broad potential. “No Events” means no tests in the state dataset—not no radon.

Radon in Decatur County, Tennessee: quick answers

EPA zone: Zone 2Region: West TennesseeState test data: No 2022–2023 state test records for this county

Is radon a problem in Decatur County, Tennessee?

It can be. Decatur County is in EPA Zone 2, where the predicted average indoor screening level is 2 to 4 pCi/L. Homes above EPA's 4 pCi/L action level are found in every zone, so a test is the only way to know your home's level.

Do new homes in Decatur County, TN have to be built radon-resistant?

No. Unincorporated Decatur County is outside state enforcement, and in Decaturville, Parsons and Scotts Hill the state's 2018 code applies without the radon appendix. Local code details

How do I test my home for radon in Decatur 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 Decatur 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 Decatur County from nearby cities. How to choose a radon professional

01 / QUICK READ

Moderate predicted potential, no local measurements, and no construction mandate.

Test every Decatur County home—including new construction.

Tennessee’s dashboard recorded no Decatur County tests in its 2022–2023 view. Neither the unincorporated county’s opt-out path nor the state program used in Decaturville, Parsons and Scotts Hill requires radon-resistant construction. [1] [2] [3]

Bottom line
A zone label, a new-home label and a blank public dataset are not substitutes for a property-level test.
Zone 2Moderate-potential designation: predicted average indoor levels of 2–4 pCi/L. [4]
No EventsDecatur County’s result on two checks of the combined 2022–2023 state view. [3]
0 localNRPP- or NRSB-listed professionals based in Decatur County. [5] [6]
46.1 miDistance from Decaturville to the nearest visible NRPP listing, in Lawrenceburg. [5]
02 / RISK & DATA

The public dashboard has no Decatur County tests to summarize.

“No Events” describes one limited state dataset. It does not describe the air inside any home.

EPA radon potential
Zone 2

Predicted average indoor radon from 2 to 4 pCi/L. The designation is a broad planning category—not a property-level measurement. [4]

COUNTY LABEL VERIFIED ON 2 LOADS

Tennessee Radon Testing dashboard

No EventsAverage field
BlankMedian field
BlankMaximum field

On two separate loads, the tooltip itself read “County: Decatur” and “Average Radon Level: No Events.” No county average, median, maximum or test count is available to publish from the 2022–2023 view. [3]

The lower charts are health-region aggregates—not Decatur County counts.

The pre- and post-mitigation band charts do not present Decatur County as its own column and do not filter to the hovered county. No regional total or percentage is presented here as county data.

03 / BUILDING CODES

Split enforcement. The same practical result: radon construction is optional.

Rural areas are opted out. Inside the three municipalities, state inspectors enforce the 2018 IRC—but only Appendix Q was added.

OUTSIDE STATE ENFORCEMENT

Unincorporated Decatur County

The State Fire Marshal’s current permit list names seven unincorporated counties where a state residential permit is required. Decatur County is not among them, consistent with opt-out status. No county-adopted residential code or ordinance number was found. [1] [7]

Practical result: no verified residential code or radon-resistant construction requirement in unincorporated areas. Owners may request a voluntary state inspection for a certificate of occupancy. [8]
2018 IRC · APPENDIX Q ONLY

Decaturville, Parsons & Scotts Hill

All three cities appear on the State Fire Marshal’s current list where a state residential permit is required. The state program adopts the 2018 IRC “and Appendix Q”. It does not adopt Appendix F, the 2018 IRC radon appendix, and it excludes optional or recommended provisions. [1] [2]

Result: radon-resistant new construction is optional inside all three municipalities. The 2018 IRC amendment cycle took effect July 16, 2020.
NO LOCAL RULE FOUND

Schools & public buildings

No Decatur County or Decaturville rule was found requiring radon tests in schools or public buildings. A national review classifies Tennessee as encouraging—not mandating—school radon testing. [9]

HB1269/SB660 proposed annual school indoor-air programs including radon testing, but enactment was not verified. Treat it as a proposal, not current law. [10]
ADVISORY, NOT A TEST REQUIREMENT

Real-estate transactions

Tennessee’s residential property-condition disclosure form has no radon-specific line item. Radon appears in an advisory paragraph telling buyers to consider appropriate inspection contingencies. No county-level rule was found. [11]

A seller form is not a measurement. Buyers should make a radon test part of their own due diligence.
The current county opt-out resolution remains an open record.

The live State Fire Marshal list supports the county’s non-program status, but the resolution number and date were not located. Confirm them with the county clerk, county mayor or State Fire Marshal before a construction decision.

How do I find a certified radon professional in Decatur 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.

Search NRPPSearch NRSB

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.

04 / HOMEBUYERS

Put radon inside the due-diligence window.

No code path requires radon-ready construction, no seller test is required, and the nearest visible nationally listed provider is 46 miles away.

A lake house or new build can still be untested.

Decatur County’s Tennessee River and Kentucky Lake market includes waterfront homes, cabins and older properties around Bath Springs, Perryville Marina and Parsons. Lower-level living space and foundation condition make property-specific measurement more useful than a county label. [13]

The county had an estimated 11,820 residents, 6,663 housing units and seven building permits in 2025. Most decisions therefore concern existing homes—not new construction with optional features. [12]

Transaction plan

  1. Write radon testing into the inspection or due-diligence window.
  2. Book early; certified providers appear to travel into the county.
  3. For a new build, ask whether passive radon features were installed voluntarily.
  4. If mitigation is installed, retest to verify performance.
05 / TESTING RESOURCES

Start with Tennessee’s free-kit program.

A do-it-yourself kit can screen a home. For a time-sensitive purchase or sale, compare nationally certified providers and confirm travel terms first.

TDEC homeowner testing

Tennessee’s Radon Program offers free homeowner test kits and technical information for schools, real-estate professionals, contractors, code officials and inspectors.

Visit Tennessee environmental resources →
Search NRPPUse Decaturville ZIP 38329 and confirm measurement credentialsSearch NRSBFilter for a Radon Measurement SpecialistView Tennessee’s dashboardDecatur returned “No Events” on two checksCheck the state permit programUnderstand where Tennessee residential enforcement applies
06 / FAQ

Questions Decatur County homeowners ask

Is Decatur County in a high-radon zone?

Decatur County is mapped as Zone 2, the moderate-potential category with predicted average indoor levels from 2 to 4 pCi/L. A zone cannot predict one home, so every home still needs a test.

What does Tennessee’s dashboard show for Decatur County?

Two county-labeled checks returned “No Events” in the combined 2022–2023 view. That means no tests were mapped to Decatur County in this dataset; it does not mean the county has no radon.

Does unincorporated Decatur County require radon-resistant construction?

No verified mandate was found. The county is absent from the State Fire Marshal’s current list of counties where a state residential permit is required, and no county residential code was located. Confirm the current opt-out resolution before relying on that status for a project.

What about Decaturville, Parsons and Scotts Hill?

All three cities are on the state permit-required list. The state program uses the 2018 IRC plus Appendix Q only—not Appendix F for radon—so radon-resistant construction remains optional.

Are certified radon testers based in Decatur County?

The October 2026 checks found no NRPP- or NRSB-listed professional based in the county. The nearest visible NRPP listing was 46.1 miles from Decaturville, and NRSB returned no professional within 50 miles.

07 / SOURCES

Primary documents, public data & directories

  1. State Fire Marshal: Apply for a Residential Permit — current permit-required cities and counties, checked October 16, 2026.
  2. Tennessee Rule 0780-02-23 — 2018 IRC, Appendix Q, optional-provision exclusion and administrative history.
  3. Tennessee Radon Testing dashboard — two live Decatur County tooltip checks, October 16, 2026.
  4. EPA Tennessee radon-zone map; cross-checks at EPA Map of Radon Zones: Tennessee and EPA Map of Radon Zones: Tennessee.
  5. NRPP Find a Professional — Decaturville and Lexington ZIP searches, October 16, 2026.
  6. NRSB Find a Professional — Decaturville-area searches, October 16, 2026.
  7. MTAS historical jurisdiction table — Decatur County opt-out status in an older compilation.
  8. State Fire Marshal opt-out explainer — voluntary inspection option.
  9. Radon in Schools: review of state laws — Tennessee classified as “Encourage.”
  10. Tennessee HB1269 — proposed school indoor-air language; enactment not verified.
  11. Tennessee Residential Property Condition Disclosure — radon appears in buyer inspection guidance.
  12. U.S. Census QuickFacts: Decatur County — population, housing and 2025 permits.
  13. Homes.com Decatur County listings — Tennessee River and lake-market context.
  14. State Fire Marshal residential permits overview — program scope and statewide code edition.
  15. Knox County 2018 IRC amendments — confirms the 2018 radon appendix as Appendix F.
  16. Tennessee Department of Environment & Conservation — statewide radon program and free-kit information.

Method note. This page separates current state-program lists from older opt-out evidence and open local-record questions. “No Events” is reported exactly as the Decatur County tooltip displayed it on two loads; blank fields were not estimated. Health-region bars are not presented as county statistics, and directory results are dated snapshots rather than a census.