Decatur, IL Radon Levels

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.

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

Decatur, IL Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County Macon County, IL

Zip Code 62521

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.

7.43

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 7.43 pCi/L, based on 14 tests from 10 nearby cities. No readings have been submitted for Decatur 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+

Decatur, 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 Decatur, IL

No homeowner tests have been submitted for Decatur 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
Moweaqua	15.6 mi	7.00 pCi/L	1
Monticello	24.0 mi	4.50 pCi/L	2
Taylorville	27.3 mi	2.00 pCi/L	1
Shelbyville	28.0 mi	17.00 pCi/L	1
Williamsville	32.3 mi	1.00 pCi/L	1
Tuscola	35.9 mi	17.00 pCi/L	1
Le Roy	36.1 mi	5.00 pCi/L	1
Springfield	37.2 mi	6.50 pCi/L	2

Macon County Radon Profile

The bedrock and soils beneath Macon County are classified by the EPA as Radon Zone 1, the highest-risk tier, with predicted average indoor screening levels above 4 pCi/L. User-submitted readings are still sparse within Macon 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 Macon County.

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.

Why are radon readings shown from areas near Decatur?

No homeowner radon tests have been submitted for Decatur yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Macon County average—are the best available indicator of local conditions until Decatur 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 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.