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Radon in Arkansas: radon map by county

EPA's Map of Radon Zones puts 0 of Arkansas's 75 counties in Zone 1 (predicted average indoor radon above 4 pCi/L), 14 in Zone 2 and 61 in Zone 3. Of 450 building tests that radon laboratories reported for 2008 to 2017, 22.9% were at or above EPA's 4 pCi/L action level, against 36.5% nationally. The highest county share is Garland County (45.5% of 29 tests).

0
counties in Zone 1 (above 4 pCi/L predicted)
14
counties in Zone 2 (2 to 4)
61
counties in Zone 3 (below 2)
22.9%
of 450 lab tests at or above 4 pCi/L

Radon by county in Arkansas

EPA radon zone and radon test results for each county in Arkansas
CountyEPA zoneLab testsMedian4+ pCi/L
Arkansas County Zone 311.30%
Ashley County Zone 3n/an/an/a
Baxter County Zone 2165.365%
Benton County Zone 2982.234%
Boone County Zone 2122.831.8%
Bradley County Zone 310.10%
Calhoun County Zone 3n/an/an/a
Carroll County Zone 2122.029.4%
Chicot County Zone 3n/an/an/a
Clark County Zone 331.30%
Clay County Zone 310.20%
Cleburne County Zone 372.111.1%
Cleveland County Zone 330.10%
Columbia County Zone 320.60%
Conway County Zone 332.133.3%
Craighead County Zone 371.125%
Crawford County Zone 370.711.1%
Crittenden County Zone 310.10%
Cross County Zone 3n/an/an/a
Dallas County Zone 311.20%
Desha County Zone 3n/an/an/a
Drew County Zone 3n/an/an/a
Faulkner County Zone 3131.35.3%
Franklin County Zone 310.10%
Fulton County Zone 225.950%
Garland County Zone 2292.745.5%
Grant County Zone 310.90%
Greene County Zone 331.40%
Hempstead County Zone 3n/an/an/a
Hot Spring County Zone 312.10%
Howard County Zone 322.60%
Independence County Zone 2102.426.7%
Izard County Zone 231.20%
Jackson County Zone 330.10%
Jefferson County Zone 320.50%
Johnson County Zone 329.766.7%
Lafayette County Zone 3n/an/an/a
Lawrence County Zone 311.90%
Lee County Zone 3n/an/an/a
Lincoln County Zone 3n/an/an/a
Little River County Zone 310.90%
Logan County Zone 321.80%
Lonoke County Zone 331.40%
Madison County Zone 351.216.7%
Marion County Zone 210.10%
Miller County Zone 314.8100%
Mississippi County Zone 319.875%
Monroe County Zone 313.950%
Montgomery County Zone 210.60%
Nevada County Zone 3n/an/an/a
Newton County Zone 313.00%
Ouachita County Zone 320.10%
Perry County Zone 3n/an/an/a
Phillips County Zone 310.10%
Pike County Zone 3n/an/an/a
Poinsett County Zone 3n/an/an/a
Polk County Zone 312.20%
Pope County Zone 392.715.4%
Prairie County Zone 314.5100%
Pulaski County Zone 3630.96.4%
Randolph County Zone 223.250%
Saline County Zone 3282.435.8%
Scott County Zone 3n/an/an/a
Searcy County Zone 233.550%
Sebastian County Zone 3110.24.5%
Sevier County Zone 321.10%
Sharp County Zone 241.820%
St. Francis County Zone 3n/an/an/a
Stone County Zone 261.10%
Union County Zone 310.10%
Van Buren County Zone 342.50%
Washington County Zone 3412.213%
White County Zone 350.90%
Woodruff County Zone 3n/an/an/a
Yell County Zone 310.50%

Lab tests: buildings tested by radon laboratories, 2008 to 2017; median in pCi/L; “4+ pCi/L” is the share of tests at or above EPA's action level. n/a: no value on file (no tests, or too few to report).

What the zones mean

Zone 1 counties have a predicted average indoor radon screening level above 4 pCi/L, Zone 2 from 2 to 4 pCi/L and Zone 3 below 2 pCi/L. The prediction is from 1993 indoor measurements, geology, aerial radioactivity, soils and foundation types. EPA: “This map should not be used to determine if individual homes need to be tested.” EPA recommends fixing a home at 4 pCi/L or more and considering a fix between 2 and 4 pCi/L, because there is no known safe level of exposure.

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Radon in Arkansas: questions

What radon zone is Arkansas?

EPA's 1993 map does not give states one zone; it zones each county. In Arkansas, 0 counties are Zone 1, 14 Zone 2 and 61 Zone 3. EPA says the map "should not be used to determine if individual homes need to be tested".

Which Arkansas counties have the highest radon levels?

By the share of laboratory tests at or above 4 pCi/L for 2008 to 2017 (counties with 20 or more tests): Garland County 45.5% (median 2.7 pCi/L, 29 tests); Saline County 35.8% (median 2.4 pCi/L, 28 tests); Benton County 34% (median 2.2 pCi/L, 98 tests); Washington County 13% (median 2.2 pCi/L, 41 tests); Pulaski County 6.4% (median 0.9 pCi/L, 63 tests).

How common is high radon in Arkansas?

22.9% of the 450 tests in the laboratory data for Arkansas (2008 to 2017) were at or above 4 pCi/L; the national share was 36.5%. Buildings are tested by choice, often because of a sale or a concern, so the share describes the tests on file, not every home.

Should I test for radon in Arkansas?

Yes. EPA recommends testing every home no matter where it is, fixing it at 4 pCi/L or more and considering a fix between 2 and 4 pCi/L, because there is no known safe level of radon exposure.

States bordering Arkansas

Radon in Louisiana (0 of 64 in Zone 1)Radon in Mississippi (0 of 82 in Zone 1)Radon in Missouri (11 of 115 in Zone 1)Radon in Oklahoma (0 of 77 in Zone 1)Radon in Tennessee (39 of 95 in Zone 1)Radon in Texas (0 of 254 in Zone 1)

Other free hazard lookups

All of these, plus wetlands, FEMA hazard ratings and the federal contamination lists, are in the Environmental Records Report for any US address ($29).

Superfund sites in Arkansas · Radon map of every state

Data compiled 2026-10-20. County-level screening information, not a radon measurement of any building.