Grantsburg, IL Radon Levels

Q: What EPA Radon Zone is Grantsburg in?

Grantsburg is in Johnson County, EPA Zone 2.

Q: How much does radon mitigation cost in Grantsburg?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Check local Grantsburg radon levels and find certified testing and mitigation professionals to keep your home safe

Grantsburg, IL Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Johnson County, IL

Zip Code 62943

Positioned in Johnson County in southern Illinois near the Shawnee National Forest, Grantsburg sits on sandstone and shale formations that generally produce lower radon levels compared to northern Illinois. Although specific testing data for zip code 62943 is limited, the area's geological conditions suggest moderate radon potential. Homeowners should still test for radon, especially in older homes with stone foundations or enclosed basement spaces where gas can concentrate.

7.50

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 7.50 pCi/L, based on 2 tests from 2 nearby cities. No readings have been submitted for Grantsburg yet, so the closest recorded data is shown as a benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Grantsburg, IL Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

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Radon Readings Near Grantsburg, IL

No homeowner tests have been submitted for Grantsburg yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.

City	Distance	Avg User Level	Readings
Marion	25.7 mi	5.00 pCi/L	1
Murphysboro	41.2 mi	10.00 pCi/L	1

Johnson County Radon Profile

Johnson County is mapped as EPA Radon Zone 2, where the local geology is predicted to produce moderate indoor screening levels between 2 and 4 pCi/L. User-submitted readings are still sparse within Johnson County itself, so the nearby measurements shown on this page provide the closest real-world picture of local radon conditions. Radon is the second leading cause of lung cancer in the United States, and a short-term test is the only way to confirm a specific home's level in Johnson County.

Radon FAQ for Grantsburg, IL

What EPA Radon Zone is Grantsburg in?

Grantsburg and the 62943 zip code are in Johnson County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

Why are radon readings shown from areas near Grantsburg?

No homeowner radon tests have been submitted for Grantsburg yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Johnson County average—are the best available indicator of local conditions until Grantsburg homeowners submit their own results. The EPA still recommends testing every individual home, since levels can vary significantly from house to house.

How much does radon mitigation cost in Grantsburg?

Radon mitigation in Grantsburg typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Grantsburg?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.