Alma, IL Radon Levels

Q: What EPA Radon Zone is Alma in?

Alma is in Marion County, EPA Zone 2.

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

No homeowner radon tests have been submitted for Alma yet, so readings from the closest cities and the Marion 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 Alma?

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

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

Alma, IL Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Marion County, IL

Zip Code 62807

Situated in Marion County in south-central Illinois, Alma experiences moderate radon potential as part of EPA Zone 2. The region's Pennsylvanian-era geology, including coal-bearing deposits and underlying limestone, can contribute to variable radon levels across different properties. Current testing data for zip code 62807 remains limited, making professional radon assessment valuable for homeowners seeking to understand their specific exposure risk.

5.00

pCi/L area average

Above EPA Action Level

Marion County average: 5.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Alma 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+

Alma, 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 Alma, IL

No homeowner tests have been submitted for Alma 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
Kell	14.4 mi	5.00 pCi/L	1
Carlyle	26.3 mi	13.00 pCi/L	1
Mount Vernon	28.1 mi	4.00 pCi/L	1
Effingham	33.5 mi	4.33 pCi/L	3
Highland	41.2 mi	6.00 pCi/L	1
Lebanon	48.4 mi	10.50 pCi/L	2

Marion County Radon Profile

EPA mapping assigns Marion County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Homeowner-submitted tests from 1 city in Marion County average 5.00 pCi/L across 1 test — 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 Marion County home regardless of zone or a neighbor's results.

Radon FAQ for Alma, IL

What EPA Radon Zone is Alma in?

Alma and the 62807 zip code are in Marion 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.

Why are radon readings shown from areas near Alma?

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

Radon mitigation in Alma 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 Alma?

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.