San Jose, IL Radon Levels

Q: What EPA Radon Zone is San Jose in?

San Jose is in Mason County, EPA Zone 1.

Q: How much does radon mitigation cost in San Jose?

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

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

San Jose, IL Radon Facts

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

County Mason County, IL

Zip Code 62682

This small community in Mason County sits within the Illinois River valley region, where alluvial soils over limestone bedrock create variable radon conditions. Testing data for zip code 62682 is currently limited, making it difficult to establish average radon levels for the area. Given the geological context of central Illinois, homeowners should still conduct professional radon testing to ensure safe indoor air quality.

7.64

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 7.64 pCi/L, based on 14 tests from 10 nearby cities. No readings have been submitted for San Jose 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+

San Jose, 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 San Jose, IL

No homeowner tests have been submitted for San Jose 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	19.4 mi	8.00 pCi/L	1
Mapleton	21.5 mi	8.00 pCi/L	1
Mackinaw	24.4 mi	20.00 pCi/L	1
Williamsville	25.1 mi	1.00 pCi/L	1
East Peoria	26.7 mi	8.00 pCi/L	3
Peoria	28.3 mi	5.00 pCi/L	1
Cuba	29.4 mi	6.00 pCi/L	1
Springfield	35.3 mi	6.50 pCi/L	2

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 San Jose, IL

What EPA Radon Zone is San Jose in?

San Jose and the 62682 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 San Jose?

No homeowner radon tests have been submitted for San Jose 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 San Jose 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 San Jose?

Radon mitigation in San Jose 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 San Jose?

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.