Mason City, IL Radon Levels

Q: What EPA Radon Zone is Mason City in?

Mason City is in Mason County, EPA Zone 1.

Q: How much does radon mitigation cost in Mason City?

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

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

Mason City, IL Radon Facts

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

County Mason County, IL

Zip Code 62664

Central Illinois community Mason City lies in Mason County along the Illinois River valley, where alluvial soils over limestone bedrock can create variable radon conditions from property to property. While specific testing data for zip code 62664 is not currently available, the region's geological characteristics suggest potential for moderate radon levels. Homeowners in this rural area should conduct professional testing, particularly those with full or partial basement foundations common in the area's older housing stock.

8.13

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 8.13 pCi/L, based on 15 tests from 10 nearby cities. No readings have been submitted for Mason City yet, so the closest recorded data is shown as a benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Mason City, 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 Mason City, IL

No homeowner tests have been submitted for Mason City 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
Lincolns New Salem	12.7 mi	8.00 pCi/L	1
Williamsville	18.9 mi	1.00 pCi/L	1
Mapleton	28.3 mi	8.00 pCi/L	1
Springfield	28.5 mi	6.50 pCi/L	2
Mackinaw	29.8 mi	20.00 pCi/L	1
Cuba	32.7 mi	6.00 pCi/L	1
East Peoria	33.4 mi	8.00 pCi/L	3
Peoria	35.1 mi	5.00 pCi/L	1

Mason County Radon Profile

Mason 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. Few homeowner tests have been logged inside Mason County so far, which is why this page draws on the nearest recorded readings to illustrate regional radon levels. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Mason County to test, as levels can differ between neighboring homes.

Radon FAQ for Mason City, IL

What EPA Radon Zone is Mason City in?

Mason City and the 62664 zip code are in Mason 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 Mason City?

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

Radon mitigation in Mason City 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 Mason City?

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.