Is radon high in ZIP 56721?

High. The model's predicted long-term basement average for ZIP 56721 is 5.1 pCi/L (SD 0.09), with above-ground floors at 2.3 pCi/L. That is about 2.3× the average US ZIP code (2.2) and about 1.3× the Polk County average of 3.9. It ranks 1 of 16 ZIPs in the county.

Do I need to test my home in 56721?

Yes, now. A predicted average at or above the EPA action level of 4 pCi/L means most homes in 56721 would qualify for mitigation. Use a short-term charcoal kit or a continuous monitor; if the result is 4 or higher, get bids for a mitigation system (typically $800-$2,500).

What EPA radon zone is ZIP 56721 in?

ZIP 56721 lies mostly in Polk County, which the EPA classifies as Radon Zone 1 (highest potential (predicted average > 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 56721

HighEPA Zone 1

ZIP 56721 (Polk County, Minnesota): predicted long-term basement average of 5.1 pCi/L (model estimate), about 2.3× the average US ZIP (2.2) and about 2.1× the Minnesota average (2.4). This is the most populous ZIP in Polk County.

Test ZIP 56721 now - and consider a continuous monitor

The model predicts a long-term basement average of 5.1 pCi/L here, at or above the EPA action level of 4. Homes in the same ZIP still vary widely, so a real test is the only way to know your number. A continuous digital monitor shows how your level swings with weather and season, which matters when you're near the action level.

Get a continuous radon monitor →Or start with a short-term test kit

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.

5.1 ± 0.09

pCi/L predicted basement mean (model SD)

2.3 ± 0.07

pCi/L predicted upstairs mean

4.4 ± 0.08

pCi/L predicted typical screening test

How 56721 compares

Within Polk County, ZIP 56721 ranks #1 of 16 ZIPs by predicted basement level; the county average is 3.9 pCi/L and its ZIPs run from 3.0 to 5.1. The county is EPA Radon Zone 1. About 10,096 people lived in this ZIP at the 2010 Census.

A screening test in a typical 56721 home is predicted at 4.4 pCi/L, so first-floor living space - not just the basement - can exceed the action level here. Mitigation systems are routine in this range and typically cost $800-$2,500.

Other ZIP codes in Polk County

567163.4
565423.1
567623.7
565403.2
565353.2
565563.2
567233.6
567363.3
565233.8
565923.1
567223.2
566463.2
566843.0
565173.5
565683.6

ZIP 56721 radon questions

Is radon high in ZIP 56721?: High. The model's predicted long-term basement average for ZIP 56721 is 5.1 pCi/L (SD 0.09), with above-ground floors at 2.3 pCi/L. That is about 2.3× the average US ZIP code (2.2) and about 1.3× the Polk County average of 3.9. It ranks 1 of 16 ZIPs in the county.
Do I need to test my home in 56721?: Yes, now. A predicted average at or above the EPA action level of 4 pCi/L means most homes in 56721 would qualify for mitigation. Use a short-term charcoal kit or a continuous monitor; if the result is 4 or higher, get bids for a mitigation system (typically $800-$2,500).
What EPA radon zone is ZIP 56721 in?: ZIP 56721 lies mostly in Polk County, which the EPA classifies as Radon Zone 1 (highest potential (predicted average > 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.