Robertson County Radon
The county and Greenbrier have adopted the IRC radon appendix, but no local rule found in this review makes radon-resistant construction mandatory. In a fast-growing Zone 2 county, the practical safeguard is still a test.
EPA zone: Zone 2Region: Middle TennesseeState test data: State test figures confirmed on repeat checks
It can be. Robertson 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.
Not effectively. Unincorporated Robertson County's 2021 code includes the radon appendix (AF), but no local rule triggers it, so radon-resistant features are effectively optional. Springfield's last documented code also includes it. Local code details
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
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
Tennessee doesn't license radon professionals, so look for NRPP or NRSB certification. Search both national directories by ZIP code; certified professionals often serve Robertson County from nearby cities. How to choose a radon professional
Local construction rules offer a pathway to radon-resistant building, not a blanket guarantee. Verified county test data includes at least one result above the EPA action level, while certified in-county measurement capacity is thin.
Unincorporated Robertson County and Greenbrier both include the 2021 IRC radon appendix. Springfield’s last documented 2012 code also included all appendices, but its current IRC edition is unresolved.123
The county tooltip also reports a 2.8 average and 0.8 median. The statewide dashboard covers 2022–2023 tests; its band charts are regional, not county-specific.4
One Springfield listing was found. NRSB returned no county-based measurement specialists in a 50-mile search, although regional providers do serve the area.67
The review found no Robertson County or Springfield requirement for radon testing in public buildings, schools, or real-estate transactions beyond Tennessee’s statewide framework. This is a research finding, not proof that no unpublished policy exists.
The radon appendix can be present in the codebook without being triggered for every permit. That distinction matters most for buyers assuming a new home automatically includes radon-resistant features.
2021 IRC · Appendix AF included
Resolution No. 121525100 adopts “Appendixes AA thru AJ and AM thru AQ,” which includes Appendix AF, Radon Control Methods.
The county excludes R313.2 and Chapter 11, but no exclusion of Appendix AF was identified. In Zone 2, and without a local mandate found, radon-resistant construction is effectively optional. The exact effective date and any trigger amendment remain unconfirmed.1
2012 IRC · “including all appendices”
The last documented municipal text adopts the 2012 IRC in full, including Appendix F. Later amendments remove permit-fee Appendix L and modify sprinklers and energy provisions, but do not remove the radon appendix.
Springfield’s current website lists several 2021 codes but no IRC edition. A newer residential-code adoption could not be verified online.211
2021 IRC · all appendices
Ordinance No. 21-23 adopts the 2021 IRC and “All Appendices of all codes listed above.” That includes Appendix AF. As elsewhere in the county, no local rule was found that turns the appendix into a universal new-home requirement.3
Both towns appear to administer permits or inspections, but no online IRC edition or appendix list was located. Confirm directly with the local inspector or recorder before describing radon-resistant construction as required or optional.1213
For new construction, request plans or inspection records showing whether a passive or active radon system was installed. Code adoption alone does not establish that a system is present.
EPA zone designations predict broad potential, not the result for a specific address. Robertson County’s verified dashboard maximum crosses the 4.0 pCi/L action level.
Moderate potential: predicted average indoor radon levels of 2–4 pCi/L.5
How to read this: the maximum is 1.9 pCi/L above the EPA’s 4.0 pCi/L action level. The dashboard tooltip values were confirmed through repeated reads. Do not use its pre/post-mitigation bar counts for county claims: selecting Robertson filters those charts to the Mid-Cumberland Region, not Robertson County alone.4
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.
Robertson County’s population grew 10.1% from April 2020 to July 2025, with 823 building permits in 2025 and 983 in 2024. The new-construction audience is substantial—and new homes still need testing.8
Zone 2 and a county average below 4.0 do not clear an individual property. Test existing homes and new construction.
Tennessee’s disclosure framework asks about known radon-related hazards, but sellers have no duty to test. Buyers can use an inspection contingency to preserve testing time.9
For a new home, request plans, photographs, labels, or inspection records for any passive or active radon system. “Built to code” is not the same as “radon-ready.”
TDEC’s Radon Program offers free test kits to Tennessee homeowners and publishes guidance for residents and real-estate professionals.15
Start with a test, use certified help when you need it, and keep testing on a regular schedule—even after a mitigation system is installed.
Hotline information: U.S. EPA and CDC.
1-800-644-6999 — the Fix-It Hotline, for general guidance on lowering radon in your home.
Hotline information: U.S. EPA and CDC.
Take the American Lung Association’s free Radon Basics course.
Health statistics and testing guidance: American Lung Association.
Links below are the exact source locations used by the research. Directory and dashboard findings reflect checks completed October 15, 2026.
Research synthesis dated October 15, 2026. Directory counts and local code status can change. Verify permit requirements with the controlling jurisdiction before relying on them for a project or transaction.