EPA radon potential
Zone 3Predicted average indoor screening level below 2 pCi/L. EPA’s zone guidance says elevated homes occur in all three zones and every home should be tested. [3] [4]
01 / QUICK READ
The map says lower potential. The evidence still says test.
Dyersburg does not require radon-resistant new construction.
The city adopted the 2021 International Residential Code through Ordinance BB713, effective March 15, 2024. Its appendix list omits Appendix AF, “Radon Control Methods,” so radon-resistant construction remains optional. The unincorporated county’s code status is still open. [1] [2]
Bottom line
Zone 3 and “new construction” are not substitutes for a property-level test.
Zone 3 and “new construction” are not substitutes for a property-level test.
02 / RISK & DATA
The public dashboard contains no Dyer County test events.
That absence is a data gap—not evidence that the county has no radon or that every home is low.
COUNTY LABEL VERIFIED TWICE
Tennessee Radon Testing dashboard
No EventsAverage field
BlankMedian field
BlankMaximum field
On two separate hovers, the tooltip’s own label read “County: Dyer” and “Average Radon Level: No Events.” No county average, median, maximum or count exists to publish from this 2022–2023 dataset. [5]
The lower charts are health-region aggregates—not Dyer County counts.
The pre- and post-mitigation bands are labeled by health region. They cannot be used as Dyer County test totals or percentages.
03 / BUILDING CODES
One city answer. One county question still open.
Dyersburg’s ordinance is clear. The unincorporated county’s specific code edition and appendix list were not available online.
2021 IRC · APPENDIX AF OMITTED
City of Dyersburg
Ordinance BB713 adopted the 2021 IRC, effective March 15, 2024. Its appendix list is AA, AB, AC, AD, AG, AH, AJ, AK, AM, AN, AO, AP, AQ and AV. Appendix AF—the radon appendix—is absent. [1]
COUNTY CODE NOT VERIFIED
Unincorporated Dyer County
The county operates its own Building & Zoning Office and issues construction permits, so it is not under State Fire Marshal residential enforcement. The permit application names no IRC edition. [2] [8]
No Dyer-specific radon rule was found.
No local radon mandate surfaced for public buildings, schools or real-estate transactions. Tennessee is classified as encouraging—not requiring—school radon testing. [9]
How do I find a certified radon professional in Dyer 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.
04 / HOMEBUYERS
The inspection contingency is the testing gateway.
Tennessee does not require a radon test in a home sale. The state disclosure framework advises buyers to use inspection contingencies, including for radon. [10]
No county average can answer for the home.
Dyer County’s market is dominated by existing homes. The county issued about 75 building permits in 2025, while its July 2025 population estimate was down 1.3% from the April 2020 base. [11]
For new construction, Dyersburg’s code does not require the radon appendix and the county’s status is unresolved. Ask the builder whether a sealed vapor retarder and sub-slab depressurization rough-in were installed, request plans or photos, and test the finished home.
Transaction plan
- Put radon testing inside the inspection or due-diligence window.
- Book early; certified providers may travel 60 or more miles.
- For a new build, ask for passive-system plans and installation photos.
- If mitigation is installed, retest to verify performance.
05 / TESTING RESOURCES
Search beyond Dyersburg—and verify the credential.
With no nationally certified professional based locally, confirm service area, measurement credential and transaction timing before booking.
Start with the NRPP search near 38024
The live search showed the nearest visible listings in Dexter, Missouri and Memphis. The result set includes more than measurement professionals, so inspect each credential.
Search NRPP near Dyersburg →06 / FAQ
Questions Dyer County homeowners ask
Is Dyer County in a high-radon zone?
No. Dyer County is mapped as EPA Zone 3, the lower-potential category with a predicted average indoor screening level below 2 pCi/L. Elevated homes can occur in any zone, so a test is still the property-level answer.
What does Tennessee’s dashboard show for Dyer County?
Two county-labeled checks showed “No Events.” The 2022–2023 dataset therefore supplies no Dyer County average, median, maximum or test count to publish.
Does Dyersburg require radon-resistant new construction?
No. Dyersburg’s 2021 IRC adoption omits Appendix AF, “Radon Control Methods,” so radon-resistant construction is optional in the city.
What about unincorporated Dyer County?
The county runs its own Building & Zoning Office, but its IRC edition and radon-appendix status could not be verified online. Confirm directly with the county before relying on a code requirement.
Are certified radon testers based in Dyer County?
The October 2026 directory checks found none based in the county. The nearest visible NRPP results were about 61 miles away in Dexter, Missouri and about 63 miles away in Memphis; NRSB returned no measurement professional within 100 miles.
07 / SOURCES
Primary documents, public data & directories
- City of Dyersburg current code editions — Ordinances BB713 and BB720, including the 2021 IRC appendix list.
- Dyer County official website — Building & Zoning contact information.
- EPA Map of Radon Zones: Tennessee.
- EPA radon-zone explainer; Dyer County designation corroborated by the EPA Map of Radon Zones: Tennessee.
- Tennessee Radon Testing dashboard — two live Dyer County tooltip checks, October 16, 2026.
- NRPP professional search near 38024 — live search, October 16, 2026.
- NRSB Find a Professional — 100-mile measurement specialist and technician searches.
- Dyer County construction permit application — county permit authority; no code edition stated.
- Radon in Schools: review of state laws — Tennessee classified as “Encourage.”
- Tennessee property-disclosure materials — inspection-contingency guidance.
- Census QuickFacts: Dyer County — population, housing and 2025 permits.
- Census QuickFacts: Dyersburg — city population and housing context.
- MTAS Statewide Building Standards — state code baseline and optional-provision treatment.
Method note. This page separates verified local findings from open questions. “No Events” was published only after two matching county-labeled reads. Health-region bars are not presented as county statistics. Directory results are dated snapshots, not a census.