Radon levels in Arkansas: Low
The model predicts a population-weighted basement average of 1.8 pCi/L (model estimate) across Arkansas's 75 counties - close to the US average of 1.8 pCi/L. Above-ground floors average 0.9 pCi/L.
Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.
0 / 75
EPA Zone 1 counties (0%)
14 / 61
Zone 2 / Zone 3 counties
0
counties predicted ≥ 4 pCi/L
0%
of ZIP codes predicted ≥ 4 pCi/L
Test Arkansas once anyway - radon varies house to house
The predicted basement average here is 1.8 pCi/L, below the EPA's 2 pCi/L "consider fixing" threshold. That's good news for the area - but the EPA still recommends every home be tested, because foundation cracks, soil pockets and ventilation make one house very different from its neighbor. One inexpensive kit settles it.
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What the data says about radon in Arkansas
0 of Arkansas's 75 counties are EPA Zone 1 (0%), 14 are Zone 2 and 61 are Zone 3 on the EPA's county-level map. Most counties fall in Zone 3, the EPA's lowest-potential class (predicted screening average under 2 pCi/L). The zones were drawn once, from geology and the tests available in 1993, and the EPA itself notes that homes with elevated radon exist in all three zones.
Weighted by where people live, Arkansas's predicted basement average is 1.8 pCi/L - close to the US average of 1.8 - which puts the state in the low range. Of the 75 counties with predictions, 0 are predicted at or above 4 pCi/L, 12 in the 2-4 band and 63 below 2. The county range is narrow: from Lafayette County at 1.39 to Boone County at 2.25 pCi/L, a spread of only 0.86.
Nationally 4.2% of ZIPs are predicted at 4+ pCi/L and 48.7% at 2+; in Arkansas it is 0% and 13% - below the national figures on both counts. No ZIP in the state is predicted above 4 on average - but averages hide individual homes, which is why the EPA still asks everyone to test.
Arkansas counties by predicted radon
Sorted highest to lowest predicted basement average (model estimate). 75 counties.
| County | Predicted basement | Upstairs | Grade | EPA zone | ZIPs |
|---|---|---|---|---|---|
| Boone County | 2.3 pCi/L | 1.2 | Moderate | EPA Zone 2 | 3 |
| Carroll County | 2.3 pCi/L | 1.1 | Moderate | EPA Zone 2 | 6 |
| Madison County | 2.2 pCi/L | 1.1 | Moderate | EPA Zone 3 | 9 |
| Searcy County | 2.2 pCi/L | 1.1 | Moderate | EPA Zone 2 | 6 |
| Benton County | 2.1 pCi/L | 1.2 | Moderate | EPA Zone 2 | 17 |
| Polk County | 2.1 pCi/L | 1.0 | Moderate | EPA Zone 3 | 6 |
| Stone County | 2.1 pCi/L | 1.0 | Moderate | EPA Zone 2 | 7 |
| Washington County | 2.1 pCi/L | 1.2 | Moderate | EPA Zone 3 | 14 |
| Baxter County | 2.1 pCi/L | 1.1 | Moderate | EPA Zone 2 | 11 |
| Newton County | 2.1 pCi/L | 1.0 | Moderate | EPA Zone 3 | 10 |
| Fulton County | 2.0 pCi/L | 1.1 | Moderate | EPA Zone 2 | 8 |
| Independence County | 2.0 pCi/L | 1.1 | Moderate | EPA Zone 2 | 13 |
| Garland County | 2.0 pCi/L | 1.1 | Low | EPA Zone 2 | 8 |
| Marion County | 2.0 pCi/L | 1.0 | Low | EPA Zone 2 | 7 |
| Montgomery County | 1.9 pCi/L | 1.0 | Low | EPA Zone 2 | 7 |
| Sharp County | 1.9 pCi/L | 1.0 | Low | EPA Zone 2 | 7 |
| Cleburne County | 1.9 pCi/L | 1.0 | Low | EPA Zone 3 | 10 |
| Izard County | 1.9 pCi/L | 0.9 | Low | EPA Zone 2 | 14 |
| Van Buren County | 1.8 pCi/L | 1.0 | Low | EPA Zone 3 | 7 |
| Perry County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 6 |
| Scott County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 4 |
| Yell County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 10 |
| Greene County | 1.8 pCi/L | 0.8 | Low | EPA Zone 3 | 5 |
| Johnson County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 8 |
| Randolph County | 1.8 pCi/L | 1.1 | Low | EPA Zone 2 | 8 |
| Conway County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 7 |
| Crawford County | 1.8 pCi/L | 0.8 | Low | EPA Zone 3 | 8 |
| Franklin County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 6 |
| Logan County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 9 |
| Pope County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 8 |
| Cross County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 4 |
| Pike County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 7 |
| White County | 1.8 pCi/L | 0.9 | Low | EPA Zone 3 | 12 |
| Faulkner County | 1.7 pCi/L | 0.9 | Low | EPA Zone 3 | 8 |
| Lawrence County | 1.7 pCi/L | 0.9 | Low | EPA Zone 3 | 10 |
| Saline County | 1.7 pCi/L | 0.9 | Low | EPA Zone 3 | 10 |
| Hot Spring County | 1.7 pCi/L | 0.9 | Low | EPA Zone 3 | 3 |
| Clark County | 1.7 pCi/L | 0.8 | Low | EPA Zone 3 | 4 |
| Craighead County | 1.7 pCi/L | 1.0 | Low | EPA Zone 3 | 10 |
| Clay County | 1.6 pCi/L | 0.9 | Low | EPA Zone 3 | 10 |
| Howard County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 4 |
| Lonoke County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 9 |
| Jackson County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 5 |
| Sebastian County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 12 |
| Sevier County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 4 |
| Grant County | 1.6 pCi/L | 0.9 | Low | EPA Zone 3 | 4 |
| St. Francis County | 1.6 pCi/L | 0.9 | Low | EPA Zone 3 | 7 |
| Poinsett County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 7 |
| Prairie County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 5 |
| Monroe County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 4 |
| Phillips County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 7 |
| Woodruff County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 3 |
| Cleveland County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 3 |
| Mississippi County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 12 |
| Ouachita County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 5 |
| Lee County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 4 |
| Pulaski County | 1.6 pCi/L | 0.8 | Low | EPA Zone 3 | 20 |
| Crittenden County | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 8 |
| Dallas County | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 4 |
| Lincoln County | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 4 |
| Little River County | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 5 |
| Chicot County | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 3 |
| Arkansas County | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 10 |
| Bradley County | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 4 |
| Calhoun County | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 3 |
| Hempstead County | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 7 |
| Columbia County | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 4 |
| Miller County | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 4 |
| Ashley County | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 6 |
| Jefferson County | 1.4 pCi/L | 0.8 | Low | EPA Zone 3 | 9 |
| Nevada County | 1.4 pCi/L | 0.8 | Low | EPA Zone 3 | 4 |
| Union County | 1.4 pCi/L | 0.8 | Low | EPA Zone 3 | 6 |
| Desha County | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 7 |
| Drew County | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 4 |
| Lafayette County | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 5 |
Radon levels in Arkansas cities
The 9 most-populous Arkansas places among the 1,000 largest US cities (Census incorporated places and CDPs), by population. City figures are ZIP-land-weighted means of the model's ZIP predictions (model estimate).
| City | Population | Predicted basement | Upstairs | Grade | ZIPs ≥ 4 |
|---|---|---|---|---|---|
| Little Rock | 203,842 | 1.5 pCi/L | 0.8 | Low | 0% |
| Fayetteville | 101,680 | 2.1 pCi/L | 1.2 | Moderate | 0% |
| Fort Smith | 89,770 | 1.6 pCi/L | 0.8 | Low | 0% |
| Springdale | 88,224 | 2.1 pCi/L | 1.3 | Moderate | 0% |
| Jonesboro | 80,650 | 1.7 pCi/L | 1.0 | Low | 0% |
| Rogers | 74,035 | 2.0 pCi/L | 1.1 | Moderate | 0% |
| Conway | 69,580 | 1.7 pCi/L | 0.9 | Low | 0% |
| North Little Rock | 64,531 | 1.5 pCi/L | 0.8 | Low | 0% |
| Bentonville | 59,471 | 2.0 pCi/L | 1.2 | Moderate | 0% |
Highest-radon ZIP codes in Arkansas
The 10 Arkansas ZIP codes with the highest predicted basement average (model estimate), out of 539 modeled. A ZIP average is still an area figure - neighboring homes routinely test several pCi/L apart.
| ZIP | County | Predicted basement | Upstairs | Grade |
|---|---|---|---|---|
| 72616 | Carroll County | 2.4 pCi/L | 1.2 | Moderate |
| 72768 | Benton County | 2.4 pCi/L | 1.4 | Moderate |
| 72774 | Washington County | 2.4 pCi/L | 1.2 | Moderate |
| 72633 | Marion County | 2.4 pCi/L | 1.0 | Moderate |
| 72744 | Washington County | 2.3 pCi/L | 1.3 | Moderate |
| 72747 | Benton County | 2.3 pCi/L | 1.3 | Moderate |
| 72761 | Benton County | 2.3 pCi/L | 1.4 | Moderate |
| 72740 | Madison County | 2.3 pCi/L | 1.1 | Moderate |
| 72736 | Benton County | 2.3 pCi/L | 1.2 | Moderate |
| 72753 | Washington County | 2.3 pCi/L | 1.2 | Moderate |
Arkansas radon questions
- Is radon high in Arkansas?
- Arkansas's population-weighted predicted basement average is 1.8 pCi/L, close to the US average of 1.8. 0 of its 75 modeled counties are predicted at or above the EPA action level of 4 pCi/L, 12 are in the 2-4 "consider fixing" range and 63 are below 2. 0% of Arkansas ZIP codes are predicted at 4 or higher.
- Which Arkansas county has the highest radon?
- Boone County has the highest predicted basement average in Arkansas at 2.3 pCi/L (EPA Zone 2). The lowest is Lafayette County at 1.4 pCi/L. These are area figures; individual homes in any county can test far higher.
- How many EPA Zone 1 counties are in Arkansas?
- 0 of Arkansas's 75 counties (0%) are EPA Zone 1 (highest potential), 14 are Zone 2 and 61 are Zone 3. The EPA zone map dates from 1993; the predicted values on this page come from a 2001-2021 model built on millions of actual tests, so the two can disagree for a given county.
- Should I test for radon in Arkansas?
- Yes. Even though Arkansas's predicted average is below 2 pCi/L, the EPA recommends every home be tested - radon varies house to house, and 13% of Arkansas ZIP codes are still predicted at 2 pCi/L or higher.
Arkansas radon program
State programs keep lists of certified testers and mitigators and sometimes run kit programs. We link only pages we could verify, and Arkansas's program page did not respond when we checked, so start from the EPA state radon contacts page. Then read how to test and what mitigation costs.