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Radon Levels in Grant County, Arkansas

EPA puts Grant County in Zone 3, its lowest radon zone, and only 1 radon test from it is on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Highest bordering

    31.9%

    Saline County

    Saline
    31.9%
    Pulaski
    6.8%

    2 of 6 neighbours have 30+ tests, 2007 to 2016

  • Nearest county

    31.9%

    Saline County, 29 miles

    Saline
    31.9%
    Arkansas
    22.7%

    Share at 4+ pCi/L, 47 tests, 2007 to 2016

  • Ground above low

    None

    21.3 pts below Arkansas

    Grant
    0.0%
    Arkansas
    21.3%

    Share of land USGS rates moderate or high potential

  • Tests reported

    1

    Too few for a share

    Grant
    1
    Needed
    30

    2008 to 2017, laboratory

  • EPA radon zone

    Zone 3

    Lower potential

    1. 1
    2. 2
    3. Zone 3

    1 highest, 3 lowest

    EPA predicts under 2 pCi/L indoors

Read a result for Grant County

Starts at EPA's action level

4.0pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 4.0 pCi/L

At or above 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher.

Interpret this readingWhat a fix costs

The data

Grant County, At a glance

Grant County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Grant County as a whole is an average indoor of less than 2 pCi/L (less than 75 Bq/m³). A low zone clears no address in it: homes above EPA's turn up in all three zones.

USGS geologic potential: Low across 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Grant County, 2008 to 2017, laboratory

CDC holds 1 reported test for Grant County over the 2008 to 2017 laboratory totals, a result of 0.9 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Grant County beside the counties around it is how this page reads it.

What these figures count

Only 1 test was reported to CDC for Grant County over 2008 to 2017 (laboratory totals), and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.

Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2006 to 2017 (every CDC figure on file).

How to read these figures

Grant County, Compared

Grant County radon figures, compared

Calculated by Radon411

CDC's largest figure for Grant County rests on 1 test over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 100.0 points and no rank or comparison is drawn from it. Results reached as high as 0.9 pCi/L, with a middle value of 0.9 pCi/L.

Of the counties bordering it, 2 have a figure over the 2007 to 2016 laboratory totals: Saline County reported the largest share at or above 4 pCi/L, 31.9%, and Pulaski County the smallest, 6.8%. Farther out, Garland County (46 miles away) at 45.8%, Washington County (154 miles away) at 14.3% and Benton County (175 miles away) at 31.0% have figures too. Pooled across 60 Arkansas counties, 22.7% of reported tests reached that level; across every county in the country with a figure, 35.8%.

Statewide for the same period, Garland County reported the highest share (45.8%) and Pulaski County the lowest (6.8%). EPA's 1993 map puts Grant County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 100% of the county's land low radon potential.

Arkansas, the United States and the counties around Grant County, 2007 to 2016, laboratory
AreaTestsAt or above 4 pCi/LMedian
Arkansas, pooled60 counties, pooled68722.7%Not pooled
United States, pooled2,666 counties, pooled1,939,02535.8%Not pooled
Garland Countyhighest in the state4845.8%2.9 pCi/L
Washington Countylowest in the state5614.3%2.2 pCi/L
Saline County, ARborders it4731.9%2.2 pCi/L
Pulaski County, ARborders it1036.8%0.9 pCi/L
Cleveland County, ARborders it30.0%0.1 pCi/L
Jefferson County, ARborders it20.0%0.5 pCi/L
Hot Spring County, ARborders it10.0%2.1 pCi/L
Dallas County, ARborders it10.0%1.2 pCi/L
The nearest Arkansas counties to Grant County with 30 or more tests, 2007 to 2016, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Saline County29 mi4731.9%2.2 pCi/L
Pulaski County34 mi1036.8%0.9 pCi/L
Garland County46 mi4845.8%2.9 pCi/L
Washington County154 mi5614.3%2.2 pCi/L
Benton County175 mi14531.0%1.8 pCi/L
Grant County ten-year laboratory totals, against Arkansas' pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestArkansas, pooledChange from the row before
2008 to 201710.0%0.9 pCi/L0.9 pCi/L23.2%Level
2007 to 201610.0%0.9 pCi/L0.9 pCi/L22.7%Level
2006 to 201510.0%0.9 pCi/L0.9 pCi/L22.5%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Grant County, Geology

The ground under Grant County

Predicted

USGS's geologic map puts all of Grant County's mapped land in one class: low radon potential. All of it lies in the area the map calls West Gulf Coastal Plain, to which USGS gives a radon index of 7, in the low band (5 to 8).

USGS's geologic areas under Grant County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
West Gulf Coastal PlainGlauconitic, phosphatic, and carbonaceous sediments.Low7100%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Grant County beside the ground around it

Across Arkansas 21.3% of the land is rated moderate; none of Grant County's is. Of the 6 counties that border it, 3 have more moderate-potential ground, Saline County the most at 47.2%.

Share of land by USGS radon potential: Grant County, the 6 counties bordering it and Arkansas
AreaEPA zoneLow potentialModerate potentialHigh potential
Grant CountyZone 3100%NoneNone
Saline CountyZone 352.8%47.2%None
Jefferson CountyZone 3100%NoneNone
Dallas CountyZone 3100%NoneNone
Pulaski CountyZone 390.7%9.3%None
Hot Spring CountyZone 375.1%24.9%None
Cleveland CountyZone 3100%NoneNone
Arkansas75 counties, pooled by land areaVaries78.7%21.3%None

The map rates the ground, not the air in any home.

Local help

Grant County, Local resources

Radon testing and mitigation in Grant County

What Arkansas's program says
Phone
501-661-2621
Email
ADH.EPI.Radon@arkansas.gov

What it means

Grant County, Questions

Questions about radon in Grant County

Are radon levels high in Grant County?

Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Grant County, Arkansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.9 pCi/L. Of the counties bordering it, 2 have a figure over the 2007 to 2016 laboratory totals: Saline County reported the largest share at or above 4 pCi/L, 31.9%, and Pulaski County the smallest, 6.8%.

Which counties border Grant County?

Grant County borders 6 counties: Saline County, Jefferson County, Dallas County, Pulaski County, Hot Spring County and Cleveland County.

Products

Grant County, Products

Testing a home in Grant County

No CDC figure names Grant County; the nearest county with one, Saline County (29 miles away), reported 31.9% of its tests at or above 4 pCi/L over the 2007 to 2016 laboratory totals, the only reading nearby until a test of this home. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Grant County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Grant County homes, compared

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Grant County, Bordering counties

Counties bordering Grant County

Calculated by Radon411

Grant County, Cities and towns

Cities and towns in Grant County

The Census Bureau estimates 18,756 residents in Grant County for July 1, 2025, 740 more than in 2020 (+4.1%). That works out to 30 people per square mile of land. Its largest town, Sheridan, has 5,406 residents, 28.8% of the total. Together its 5 incorporated places hold 37.1% of those residents; the other 62.9% live outside any of them. Reported testing is thin here: 1 test over 2008 to 2017, or 0.1 for every 1,000 residents (2025 estimate), where Arkansas as a whole comes to 0.2.

From Sheridan to Poyen, CDC publishes no figure by town: each reads Grant County's.

The cities and towns in Grant County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Sheridan5,406+7.1%28.8%
Tull499+2.9%2.7%
Leola471+3.1%2.5%
Prattsville299+2.7%1.6%
Poyen275+5.0%1.5%

5 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).

Grant County, Homes

Homes in Grant County

Of Grant County's 7,907 homes, 69% are detached houses, against 70% across Arkansas; 23% are mobile homes. Half of its homes were built before 1989, close to Arkansas' 1987: 8% date from before 1960 and 30% from 2000 or later. Owners live in 80% of the occupied homes (Arkansas: 66%), so for most households a test and a fix are their own to order.

Homes in Grant County, Arkansas, 2019 to 2023
HomesGrant CountyArkansas
Housing units7,9071,382,664
Detached houses69%70%
In buildings of 5 or more4%10%
Mobile homes23%11%
Built before 19608%14%
Built since 200030%28%
Middle year built19891987
Owner-occupied80%66%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.