Grantsburg, IL Radon Mitigation and Testing

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.

Johnson County

EPA Zone 2

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.

Grantsburg, IL Radon Mitigation

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

Grantsburg, IL Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Grantsburg Radon Facts

Key details about the radon risk profile for Grantsburg and the 62943 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Johnson County, IL

Zip Code

62943

Predicted Screening Level

2–4 pCi/L (Zone 2)

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

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.

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.

Most Active Radon Markets in Illinois

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Buffalo Grove	6.10 pCi/L	10
Crystal Lake	7.25 pCi/L	8
Lake Zurich	6.00 pCi/L	7
Grayslake	5.00 pCi/L	7
New Lenox	10.17 pCi/L	6
Park Ridge	7.00 pCi/L	6
Arlington Heights	6.17 pCi/L	6
Waterloo	9.20 pCi/L	5
Palatine	7.80 pCi/L	5
Round Lake	7.80 pCi/L	5
Northbrook	6.20 pCi/L	5
Mchenry	11.00 pCi/L	4
Dekalb	8.75 pCi/L	4
Columbia	8.00 pCi/L	4
Lisle	7.25 pCi/L	4
Normal	7.25 pCi/L	4
Antioch	7.00 pCi/L	4
Elk Grove Village	7.00 pCi/L	4
Aurora	6.75 pCi/L	4
Hoffman Estates	6.75 pCi/L	4