Osco, IL Radon Levels

Q: What EPA Radon Zone is Osco in?

Osco is in Henry County, EPA Zone 1.

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

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

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

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

Osco, IL Radon Facts

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

County Henry County, IL

Zip Code 61274

Located in Henry County near the Davenport Metro area, Osco lies within Illinois River valley alluvial soils over dolomite and limestone bedrock that create variable radon conditions. Testing data for this zip code 61274 community is currently limited, making individual home testing essential for residents. The underlying geological formations in this part of western Illinois can produce significant radon variations from property to property.

7.00

pCi/L area average

Above EPA Action Level

Henry County average: 7.00 pCi/L, based on 4 user-submitted tests across 4 cities in the county. No homeowner readings have been submitted for Osco 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+

Osco, 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 Osco, IL

No homeowner tests have been submitted for Osco 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
Orion	6.1 mi	4.00 pCi/L	1
Geneseo	8.8 mi	6.00 pCi/L	1
Coal Valley	11.3 mi	12.00 pCi/L	1
Moline	14.8 mi	5.00 pCi/L	1
New Windsor	15.1 mi	6.00 pCi/L	1
Rock Island	17.7 mi	4.50 pCi/L	2
Annawan	18.6 mi	10.00 pCi/L	1
Kewanee	19.6 mi	8.00 pCi/L	1

Henry County Radon Profile

Henry 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 4 cities in Henry County average 7.00 pCi/L across 4 tests — 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 Henry County to test, as levels can differ between neighboring homes.

Radon FAQ for Osco, IL

What EPA Radon Zone is Osco in?

Osco and the 61274 zip code are in Henry 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 Osco?

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

Radon mitigation in Osco 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 Osco?

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.