Marietta, IL Radon Levels

Q: What EPA Radon Zone is Marietta in?

Marietta is in Fulton County, EPA Zone 1.

Q: How much does radon mitigation cost in Marietta?

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

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

Marietta, IL Radon Facts

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

County Fulton County, IL

Zip Code 61459

This small community in Fulton County sits within the river valley region of west-central Illinois, where alluvial soils over limestone bedrock create variable radon conditions. Housing in the area consists largely of older farmstead properties and modest residential construction, many featuring partial basements or crawl spaces. Testing data for Marietta remains limited, making individual radon testing particularly important for homeowners in zip code 61459.

6.00

pCi/L area average

Above EPA Action Level

Fulton County average: 6.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Marietta 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+

Marietta, 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 Marietta, IL

No homeowner tests have been submitted for Marietta 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
Cuba	10.9 mi	6.00 pCi/L	1
Knoxville	29.0 mi	8.00 pCi/L	1
Monmouth	31.5 mi	8.00 pCi/L	1
Stronghurst	33.2 mi	13.00 pCi/L	2
Mapleton	36.0 mi	8.00 pCi/L	1
Dallas City	39.0 mi	9.00 pCi/L	1
Peoria	42.7 mi	5.00 pCi/L	1
Lincolns New Salem	45.2 mi	8.00 pCi/L	1

Fulton County Radon Profile

Fulton County falls in EPA Radon Zone 1, meaning the local uranium-bearing geology is predicted to drive average indoor radon screening levels above the EPA's 4 pCi/L action threshold. Homeowner-submitted tests from 1 city in Fulton County average 6.00 pCi/L across 1 test — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Fulton County to test, as levels can differ between neighboring homes.

Radon FAQ for Marietta, IL

What EPA Radon Zone is Marietta in?

Marietta and the 61459 zip code are in Fulton 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 Marietta?

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

Radon mitigation in Marietta 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 Marietta?

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.