Centralia, IL Radon Levels

Q: What EPA Radon Zone is Centralia in?

Centralia is in Marion County, EPA Zone 2.

Q: How much does radon mitigation cost in Centralia?

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

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

Centralia, IL Radon Facts

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

County Marion County, IL

Zip Code 62801

Positioned in Marion County within the St. Louis Metro area, Centralia sits in EPA Zone 2 where moderate radon levels are typical. The region's coal-bearing geology and Pennsylvanian-era rock formations create variable subsurface conditions that can affect radon migration patterns. With limited testing data available for zip code 62801, homeowners should consider professional radon assessment to understand their specific 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 Centralia 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+

Centralia, 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 Centralia, IL

No homeowner tests have been submitted for Centralia 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	12.1 mi	5.00 pCi/L	1
Carlyle	14.4 mi	13.00 pCi/L	1
Mount Vernon	18.8 mi	4.00 pCi/L	1
Highland	33.6 mi	6.00 pCi/L	1
Mascoutah	35.4 mi	6.50 pCi/L	2
Lebanon	36.2 mi	10.50 pCi/L	2
Marissa	38.4 mi	4.00 pCi/L	1
O Fallon	41.2 mi	6.00 pCi/L	1

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 Centralia, IL

What EPA Radon Zone is Centralia in?

Centralia and the 62801 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 Centralia?

No homeowner radon tests have been submitted for Centralia 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 Centralia 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 Centralia?

Radon mitigation in Centralia 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 Centralia?

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.