Mason, IL Radon Levels

Q: What EPA Radon Zone is Mason in?

Mason is in Effingham County, EPA Zone 2.

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

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

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

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

Mason, IL Radon Facts

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

County Effingham County, IL

Zip Code 62443

Rural Effingham County in south-central Illinois sits atop Pennsylvanian-era sedimentary rocks that typically produce moderate radon levels across the region's agricultural landscape. Although specific testing data for zip code 62443 is not yet available, the area's geological foundation of coal-bearing shale and limestone suggests radon testing should be a priority. Homeowners in this farming community should conduct professional testing, especially in properties with basements or other below-grade living spaces.

4.33

pCi/L area average

Above EPA Action Level

Effingham County average: 4.33 pCi/L, based on 3 user-submitted tests across 1 city in the county. No homeowner readings have been submitted for Mason 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+

Mason, 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, IL

No homeowner tests have been submitted for Mason 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
Effingham	11.4 mi	4.33 pCi/L	3
Kell	34.8 mi	5.00 pCi/L	1
Shelbyville	35.5 mi	17.00 pCi/L	1
Mattoon	38.0 mi	9.33 pCi/L	3
Charleston	43.3 mi	8.00 pCi/L	1
Mount Vernon	47.3 mi	4.00 pCi/L	1
Carlyle	47.7 mi	13.00 pCi/L	1
Bridgeport	49.5 mi	5.00 pCi/L	1

Effingham County Radon Profile

EPA mapping assigns Effingham 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 Effingham County average 4.33 pCi/L across 3 tests — 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 Effingham County home regardless of zone or a neighbor's results.

Radon FAQ for Mason, IL

What EPA Radon Zone is Mason in?

Mason and the 62443 zip code are in Effingham 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 Mason?

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

Radon mitigation in Mason 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?

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.