Smithshire, IL Radon Levels

Q: What EPA Radon Zone is Smithshire in?

Smithshire is in Warren County, EPA Zone 1.

Q: How much does radon mitigation cost in Smithshire?

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

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

Smithshire, IL Radon Facts

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

County Warren County, IL

Zip Code 61478

This small Warren County community in western Illinois sits on glacial till deposits over limestone bedrock, creating geological conditions that can produce variable radon levels across the rural landscape. Testing data remains limited for zip code 61478, making baseline radon testing essential for homeowners. Smithshire's scattered residential properties, including older farmhouses with partial basements and newer construction, benefit from the proactive radon testing approach recommended throughout Illinois.

8.00

pCi/L area average

Above EPA Action Level

Warren County average: 8.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Smithshire 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+

Smithshire, 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 Smithshire, IL

No homeowner tests have been submitted for Smithshire 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
Stronghurst	8.6 mi	13.00 pCi/L	2
Monmouth	12.2 mi	8.00 pCi/L	1
Dallas City	23.0 mi	9.00 pCi/L	1
Knoxville	26.9 mi	8.00 pCi/L	1
New Windsor	34.3 mi	6.00 pCi/L	1
Cuba	35.2 mi	6.00 pCi/L	1
Orion	46.2 mi	4.00 pCi/L	1
Coal Valley	49.3 mi	12.00 pCi/L	1

Warren County Radon Profile

Warren 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 Warren County average 8.00 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 Warren County to test, as levels can differ between neighboring homes.

Radon FAQ for Smithshire, IL

What EPA Radon Zone is Smithshire in?

Smithshire and the 61478 zip code are in Warren 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 Smithshire?

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

Radon mitigation in Smithshire 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 Smithshire?

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.