Dewey, IL Radon Levels

Q: What EPA Radon Zone is Dewey in?

Dewey is in Champaign County, EPA Zone 1.

Q: Why are radon readings shown from areas near Dewey?

No homeowner radon tests have been submitted for Dewey yet, so readings from the closest cities and the Champaign County average are used as the best available indicator of local conditions. The EPA recommends testing every individual home.

Q: How much does radon mitigation cost in Dewey?

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

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

Dewey, IL Radon Facts

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

County Champaign County, IL

Zip Code 61840

Part of Champaign County in central Illinois, Dewey sits on deep glacial moraine deposits over limestone bedrock that contribute to moderate-to-high radon potential across the central prairie region. While specific testing data for this 61840 zip code area is limited, the geological context suggests homeowners should conduct radon testing. The combination of glacial drift and underlying Pennsylvanian limestone creates favorable conditions for radon gas production.

10.00

pCi/L area average

Above EPA Action Level

Champaign County average: 10.00 pCi/L, based on 7 user-submitted tests across 5 cities in the county. No homeowner readings have been submitted for Dewey itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Dewey, 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 Dewey, IL

No homeowner tests have been submitted for Dewey 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
Mahomet	10.1 mi	5.00 pCi/L	1
Gifford	12.9 mi	10.00 pCi/L	1
Champaign	13.6 mi	6.67 pCi/L	3
Paxton	13.6 mi	4.00 pCi/L	1
Urbana	16.0 mi	15.00 pCi/L	1
Monticello	25.1 mi	4.50 pCi/L	2
Homer	25.4 mi	20.00 pCi/L	1
Le Roy	25.5 mi	5.00 pCi/L	1

Champaign County Radon Profile

Because of its underlying geology, Champaign County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Homeowner-submitted tests from 5 cities in Champaign County average 10.00 pCi/L across 7 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Champaign County home regardless of zone or a neighbor's results.

Radon FAQ for Dewey, IL

What EPA Radon Zone is Dewey in?

Dewey and the 61840 zip code are in Champaign 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 Dewey?

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

Radon mitigation in Dewey 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 Dewey?

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.