Is radon high in ZIP 83858?

High. The model's predicted long-term basement average for ZIP 83858 is 5.6 pCi/L (SD 0.12), with above-ground floors at 3.6 pCi/L. That is about 2.6× the average US ZIP code (2.2) and about 1.5× the Kootenai County average of 3.7. It ranks 1 of 11 ZIPs in the county.

Do I need to test my home in 83858?

Yes, now. A predicted average at or above the EPA action level of 4 pCi/L means most homes in 83858 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 83858 in?

ZIP 83858 lies mostly in Kootenai 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 83858

HighEPA Zone 1

ZIP 83858 (Kootenai County, Idaho): predicted long-term basement average of 5.6 pCi/L (model estimate), about 2.6× the average US ZIP (2.2) and about 2.1× the Idaho average (2.6).

Test ZIP 83858 now - and consider a continuous monitor

The model predicts a long-term basement average of 5.6 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.

5.6 ± 0.12

pCi/L predicted basement mean (model SD)

3.6 ± 0.12

pCi/L predicted upstairs mean

4.8 ± 0.12

pCi/L predicted typical screening test

How 83858 compares

Within Kootenai County, ZIP 83858 ranks #1 of 11 ZIPs by predicted basement level; the county average is 3.7 pCi/L and its ZIPs run from 2.2 to 5.6. The county is EPA Radon Zone 1. About 13,656 people lived in this ZIP at the 2010 Census.

A screening test in a typical 83858 home is predicted at 4.8 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 Kootenai County

838544.0
838152.4
838142.9
838354.4
838014.8
838693.6
838762.2
838102.9
838332.9
838422.8

ZIP 83858 radon questions

Is radon high in ZIP 83858?: High. The model's predicted long-term basement average for ZIP 83858 is 5.6 pCi/L (SD 0.12), with above-ground floors at 3.6 pCi/L. That is about 2.6× the average US ZIP code (2.2) and about 1.5× the Kootenai County average of 3.7. It ranks 1 of 11 ZIPs in the county.
Do I need to test my home in 83858?: Yes, now. A predicted average at or above the EPA action level of 4 pCi/L means most homes in 83858 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 83858 in?: ZIP 83858 lies mostly in Kootenai 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.