Decatur, IL Radon Mitigation and Testing

Q: What EPA Radon Zone is Decatur in?

Decatur is in Macon County, EPA Zone 1.

Q: How much does radon mitigation cost in Decatur?

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

Macon County

EPA Zone 1

As Macon County's largest city in central Illinois, Decatur sits within the glacial moraine deposits over limestone bedrock that characterize much of the state's prairie region. Current radon testing data for zip codes 62521-62523 and 62526 remains limited, but the geological conditions favor radon production and migration. Homeowners throughout this historic industrial city should conduct testing, particularly in older homes with full basements typical of mid-twentieth century construction.

Decatur, IL Radon Mitigation

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

Decatur, IL Radon Testing

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

Decatur Radon Facts

Key details about the radon risk profile for Decatur and the 62521 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Macon County, IL

Zip Code

62521

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Decatur and the 62521 zip code are located in Macon County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Decatur, IL

What EPA Radon Zone is Decatur in?

Decatur and the 62521 zip code are in Macon County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

How much does radon mitigation cost in Decatur?

Radon mitigation in Decatur 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 Decatur?

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