Franklin, IL Radon Levels

Q: What EPA Radon Zone is Franklin in?

Franklin is in Morgan County, EPA Zone 1.

Q: How much does radon mitigation cost in Franklin?

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

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

Franklin, IL Radon Facts

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

County Morgan County, IL

Zip Code 62638

Part of the St. Louis Metro area in west-central Illinois, Franklin sits in Morgan County's 62638 zip code where deep glacial moraine deposits over limestone bedrock contribute to moderate-to-high radon potential. While comprehensive testing data for this rural community remains limited, the underlying geological conditions common throughout central Illinois warrant individual home radon testing. Local housing includes both historic farmhouses from the early-to-mid 1900s and newer construction, with many properties featuring full or partial basements where radon can accumulate.

9.00

pCi/L area average

Above EPA Action Level

Morgan County average: 9.00 pCi/L, based on 2 user-submitted tests across 1 city in the county. No homeowner readings have been submitted for Franklin 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+

Franklin, 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 Franklin, IL

No homeowner tests have been submitted for Franklin 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
Jacksonville	10.7 mi	9.00 pCi/L	2
Auburn	18.5 mi	6.00 pCi/L	1
Chatham	20.4 mi	3.00 pCi/L	1
White Hall	21.4 mi	6.00 pCi/L	1
Divernon	23.0 mi	7.00 pCi/L	1
Springfield	25.9 mi	6.50 pCi/L	2
Carlinville	25.9 mi	9.00 pCi/L	1
Lincolns New Salem	32.5 mi	8.00 pCi/L	1

Morgan County Radon Profile

Because of its underlying geology, Morgan 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 1 city in Morgan County average 9.00 pCi/L across 2 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 Morgan County home regardless of zone or a neighbor's results.

Radon FAQ for Franklin, IL

What EPA Radon Zone is Franklin in?

Franklin and the 62638 zip code are in Morgan 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 Franklin?

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

Radon mitigation in Franklin 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 Franklin?

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.