Is radon high in ZIP 72521?

Moderate. The model's predicted long-term basement average for ZIP 72521 is 2.0 pCi/L (SD 0.07), with above-ground floors at 1.0 pCi/L. That is close to the average US ZIP code (2.2) and close to the Sharp County average of 1.9. It ranks 1 of 7 ZIPs in the county.

Do I need to test my home in 72521?

Yes. 72521'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 72521 in?

ZIP 72521 lies mostly in Sharp County, which the EPA classifies as Radon Zone 2 (moderate potential (2-4 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 72521

ModerateEPA Zone 2

ZIP 72521 (Sharp County, Arkansas): predicted long-term basement average of 2.0 pCi/L (model estimate), close to the average US ZIP (2.2) and about 1.2× the Arkansas average (1.8). This is the most populous ZIP in Sharp County.

Test ZIP 72521 - the EPA says "consider fixing" in this range

The predicted basement average here is 2.0 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.

2.0 ± 0.07

pCi/L predicted basement mean (model SD)

1.0 ± 0.06

pCi/L predicted upstairs mean

1.3 ± 0.06

pCi/L predicted typical screening test

How 72521 compares

Within Sharp County, ZIP 72521 ranks #1 of 7 ZIPs by predicted basement level; the county average is 1.9 pCi/L and its ZIPs run from 1.7 to 2.0. The county is EPA Radon Zone 2. About 4,814 people lived in this ZIP at the 2010 Census.

Above-ground floors are predicted at 1.0 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 Sharp County

725291.9
725421.9
725131.9
725321.8
724821.8
725691.7

ZIP 72521 radon questions

Is radon high in ZIP 72521?: Moderate. The model's predicted long-term basement average for ZIP 72521 is 2.0 pCi/L (SD 0.07), with above-ground floors at 1.0 pCi/L. That is close to the average US ZIP code (2.2) and close to the Sharp County average of 1.9. It ranks 1 of 7 ZIPs in the county.
Do I need to test my home in 72521?: Yes. 72521'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 72521 in?: ZIP 72521 lies mostly in Sharp County, which the EPA classifies as Radon Zone 2 (moderate potential (2-4 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.