North Carolina Radon Map, Levels & Testing Guide
Browse the 100 listed county pages surfaced for North Carolina. Open a listed county to compare its EPA zone, source caveats, testing meaning, and when mitigation pricing becomes worth checking.
High Risk
Moderate
Low Risk
Official Evidence in North Carolina
100 of 100 listed counties have official evidence
Open a county page to see the official source context: measurement fields, local burden, state percentile, and the next step for no reading, 2.0-3.9, or 4.0+ pCi/L.
100%
covered
Measured
100
State source
100
CDC source
0
Needs source detail
0
Measured Risk Leaders in North Carolina
County rankings from actual reported radon tests
These lists rank the visible North Carolina county pages by measured radon signals, not by the EPA zone label alone. Use them to spot where the state hub has a real data story before opening individual county pages.
100
measured counties
State-level evidence read
This hub has official measurement coverage, but most visible counties need home-specific confirmation.
The state hub is now doing a decision job: it separates first-click counties, retest counties, and lower-signal counties from 100 visible county measurement rows. None of the visible measured counties cross the elevated band, so the hub should emphasize home-specific testing rather than implied statewide danger.
First-click counties
Open Alexander County first when you need the strongest local answer. It is tagged High-end signal from 288.0 pCi/L highest measured - source does not publish a county average. 0 visible measured counties are elevated or high enough to review before lower-signal counties.
Buyer/seller lane
Buyer/seller lane: use the hub to pick the county page, but do not negotiate from statewide context alone. A property result still controls quotes and credits.
Retest lane
Retest lane: with 100 measured county rows and no elevated statewide cluster, 2.0-3.9 pCi/L is mostly a confirm-or-monitor decision until a home repeats higher.
Best county pages to open first
Start with these local evidence pages
Ranked by measured burden, 4.0+ share, test volume, and whether the EPA zone understates the measurement signal.
Alexander County
NC DHHS
288.0 pCi/L highest measured - source does not publish a county average
Alexander County has an official high-end county value of 288.0 pCi/L. Open it when the user needs proof that elevated readings have occurred locally, but keep the next step tied to a home-specific test.
Cabarrus County
NC DHHS
316.0 pCi/L highest measured - source does not publish a county average
Cabarrus County has an official high-end county value of 316.0 pCi/L. Open it when the user needs proof that elevated readings have occurred locally, but keep the next step tied to a home-specific test.
Henderson County
NC DHHS
440.0 pCi/L highest measured - source does not publish a county average
Henderson County has an official high-end county value of 440.0 pCi/L. Open it when the user needs proof that elevated readings have occurred locally, but keep the next step tied to a home-specific test.
Rutherford County
NC DHHS
681.0 pCi/L highest measured - source does not publish a county average
Rutherford County has an official high-end county value of 681.0 pCi/L. Open it when the user needs proof that elevated readings have occurred locally, but keep the next step tied to a home-specific test.
Highest 4.0+ share
Highest high-end reading
highest measured county value from source
NC DHHS
highest measured county value from source
NC DHHS
highest measured county value from source
NC DHHS
highest measured county value from source
NC DHHS
highest measured county value from source
NC DHHS
Most reported tests
Measured pattern
Among 100 visible counties with measurement tables, 0 land in the high measured-burden band and 0 land in high or elevated measured-burden bands. That lets this hub rank counties by observed test distribution instead of repeating the EPA map.
Map vs measurements
The strongest measured signals mostly align with the EPA zone structure, so the county pages can use the map as support while still leading with test data.
Source strategy
All measured rows shown here use state-specific official sources, so this hub can make source-backed county comparisons without leaning on a national fallback.
Already Tested
View North Carolina Cost Estimates
If you already have a radon result, skip the directory and move straight to local price guidance.
Understand the Number
2.0 vs 4.0 vs 8.0 pCi/L
Use the parent levels guide if you need the plain-English meaning of a radon result before browsing counties.
Need a Number First
Read the Testing Guide
Use the fastest valid radon test setup before you compare quotes or ask whether mitigation is worth it.
Browse Counties
Jump to the Directory
Open your county to see its EPA zone, testing meaning, and the point where mitigation becomes worth pricing.
Official State Resource
North Carolina radon program and rules
Use the state program link to verify local radon guidance, disclosure language, and contractor credential expectations before you act on an estimate.
Disclosure rule tracked
North Carolina requires sellers to complete a Residential Property and Owners' Association Disclosure Statement, covering environmental hazards.
Credential note
North Carolina does not require specific radon licensing. NRPP or AARST certification is recommended.
Already tested? Get your itemized mitigation cost estimate.
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