Is radon high in ZIP 72740?

Moderate. The model's predicted long-term basement average for ZIP 72740 is 2.3 pCi/L (SD 0.05), with above-ground floors at 1.1 pCi/L. That is close to the average US ZIP code (2.2) and close to the Madison County average of 2.2. It ranks 1 of 9 ZIPs in the county.

Do I need to test my home in 72740?

Yes. 72740's predicted average falls in the EPA's 2-4 pCi/L "consider fixing" band, and a meaningful share of individual homes in such areas test above 4. Test with a short-term kit and confirm anything at 2 or higher with a long-term test.

What EPA radon zone is ZIP 72740 in?

ZIP 72740 lies mostly in Madison County, which the EPA classifies as Radon Zone 3 (low potential (< 2 pCi/L)). Zones are county-wide and date from 1993; the ZIP-level prediction above is from a 2001-2021 model built on millions of tests.

Radon levels in ZIP 72740

ModerateEPA Zone 3

ZIP 72740 (Madison County, Arkansas): predicted long-term basement average of 2.3 pCi/L (model estimate), close to the average US ZIP (2.2) and about 1.3× the Arkansas average (1.8). This is the most populous ZIP in Madison County.

Test ZIP 72740 - the EPA says "consider fixing" in this range

The predicted basement average here is 2.3 pCi/L, in the 2-4 pCi/L band where the EPA recommends considering mitigation. Plenty of individual homes in a moderate area test above 4. Start with a short-term test; if it comes back at 2 or higher, follow up with a long-term test or a continuous monitor.

Get a short-term test kit →Or track it with a continuous monitor

Already tested at 4 pCi/L or higher? Find a certified mitigation professional (EPA). A mitigation system typically runs $800-$2,500 installed.

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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.

2.3 ± 0.05

pCi/L predicted basement mean (model SD)

1.1 ± 0.06

pCi/L predicted upstairs mean

1.5 ± 0.06

pCi/L predicted typical screening test

How 72740 compares

Within Madison County, ZIP 72740 ranks #1 of 9 ZIPs by predicted basement level; the county average is 2.2 pCi/L and its ZIPs run from 1.7 to 2.3. The county is EPA Radon Zone 3. About 9,543 people lived in this ZIP at the 2010 Census.

Above-ground floors are predicted at 1.1 pCi/L, below the action level, while basements sit in the 2-4 band. If you spend time in a finished basement, test there first.

Other ZIP codes in Madison County

727272.3
727382.2
727732.2
727762.0
727422.0
727211.9
727601.7
727521.7

ZIP 72740 radon questions

Is radon high in ZIP 72740?: Moderate. The model's predicted long-term basement average for ZIP 72740 is 2.3 pCi/L (SD 0.05), with above-ground floors at 1.1 pCi/L. That is close to the average US ZIP code (2.2) and close to the Madison County average of 2.2. It ranks 1 of 9 ZIPs in the county.
Do I need to test my home in 72740?: Yes. 72740's predicted average falls in the EPA's 2-4 pCi/L "consider fixing" band, and a meaningful share of individual homes in such areas test above 4. Test with a short-term kit and confirm anything at 2 or higher with a long-term test.
What EPA radon zone is ZIP 72740 in?: ZIP 72740 lies mostly in Madison County, which the EPA classifies as Radon Zone 3 (low potential (< 2 pCi/L)). Zones are county-wide and date from 1993; the ZIP-level prediction above is from a 2001-2021 model built on millions of tests.

ZIP pages are generated for ZIPs predicted at or above 2.5 pCi/L and for the most populous ZIP in each county; all other ZIPs appear in their county table. Methodology.