Is radon high in Jasper County, Illinois?

Low. The model predicts a long-term basement average of 1.9 pCi/L in Jasper County (close to the US average of 1.8 and close to the Illinois average of 1.9). That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Ranked 89 of 102 Illinois counties.

Should I test for radon in Jasper County?

Yes, once. The EPA recommends testing every home regardless of area, and the model's ZIP-level predictions in Jasper County already range from 1.6 to 2.0 pCi/L. A short-term kit costs little and settles the question for your house.

What does EPA Radon Zone 2 mean for Jasper County?

Zone 2 - moderate potential (2-4 pCi/L). The zone map dates from 1993 and classifies whole counties. The newer model's predicted average of 1.9 pCi/L does not line up with Zone 2, which is common - the EPA itself says high-radon homes exist in every zone. Neither replaces a test of your own home.

How much does radon mitigation cost in Jasper County?

A standard active sub-slab depressurization system typically runs $800-$2,500 installed nationally; Illinois quotes vary with foundation type (slab, crawlspace, basement), home size and local labor. Get two or three bids from certified mitigators listed by your state radon program or the EPA's find-a-professional page.

Radon levels in Jasper County, Illinois

LowEPA Zone 2

Predicted long-term basement average of 1.9 pCi/L (model estimate) across 7 ZIP codes - close to the US average of 1.8, close to the Illinois average of 1.9. Ranked #89 of 102 Illinois counties.

Test Jasper County, IL once anyway - radon varies house to house

The predicted basement average here is 1.9 pCi/L, below the EPA's 2 pCi/L "consider fixing" threshold. That's good news for the area - but the EPA still recommends every home be tested, because foundation cracks, soil pockets and ventilation make one house very different from its neighbor. One inexpensive kit settles it.

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

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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.

1.9 ± 0.05

pCi/L predicted basement mean (model SD)

1.0 ± 0.07

pCi/L predicted upstairs (above-ground) mean

1.6-2.0

range of ZIP-level basement predictions in the county

What this means for Jasper

The typical Jasper County home is predicted below 2 pCi/L, the lowest band. That is the best case an area can show - but it describes the average house, and the ZIP-level predictions within the county still span 1.6 to 2.0 pCi/L.

Note that the EPA classifies Jasper County as Zone 2 while the newer model predicts 1.9 pCi/L. The zone map predates two decades of test data; where they disagree, we grade on the model but show both. County figures weight each ZIP by its 2010 Census population, so they describe where people live rather than empty land.

Comparable Illinois counties: White County (1.9), Hardin County (1.9), Crawford County (1.9), Edwards County (1.9). The state's highest is Knox County at 4.0 pCi/L.

ZIP codes in Jasper County

Predicted basement and upstairs means by ZIP (model estimate). ZIPs whose land is mostly in this county.

ZIP	Basement	Upstairs	Grade
62448	2.0 ± 0.05	1.1	Low
62445	1.8 ± 0.06	1.0	Low
62479	1.6 ± 0.06	0.9	Low
62480	1.7 ± 0.06	0.9	Low
62432	1.8 ± 0.06	1.0	Low
62475	1.8 ± 0.05	0.9	Low
62481	1.7 ± 0.05	0.9	Low

If your test comes back at 4 pCi/L or higher

Mitigation is a routine job: a fan-driven pipe that vents soil gas from under the slab to above the roofline, typically $800-$2,500 installed (typical range; local quotes vary). Use certified professionals: EPA find-a-professional. Read the full mitigation guide.

Jasper County radon questions

Is radon high in Jasper County, Illinois?: Low. The model predicts a long-term basement average of 1.9 pCi/L in Jasper County (close to the US average of 1.8 and close to the Illinois average of 1.9). That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Ranked 89 of 102 Illinois counties.
Should I test for radon in Jasper County?: Yes, once. The EPA recommends testing every home regardless of area, and the model's ZIP-level predictions in Jasper County already range from 1.6 to 2.0 pCi/L. A short-term kit costs little and settles the question for your house.
What does EPA Radon Zone 2 mean for Jasper County?: Zone 2 - moderate potential (2-4 pCi/L). The zone map dates from 1993 and classifies whole counties. The newer model's predicted average of 1.9 pCi/L does not line up with Zone 2, which is common - the EPA itself says high-radon homes exist in every zone. Neither replaces a test of your own home.
How much does radon mitigation cost in Jasper County?: A standard active sub-slab depressurization system typically runs $800-$2,500 installed nationally; Illinois quotes vary with foundation type (slab, crawlspace, basement), home size and local labor. Get two or three bids from certified mitigators listed by your state radon program or the EPA's find-a-professional page.

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