North Henderson, IL Radon Levels

Q: What EPA Radon Zone is North Henderson in?

North Henderson is in Mercer County, EPA Zone 1.

Q: How much does radon mitigation cost in North Henderson?

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

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

North Henderson, IL Radon Facts

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

County Mercer County, IL

Zip Code 61466

Situated in Mercer County within the Davenport metropolitan area, North Henderson lies in Illinois River valley terrain where alluvial soils over limestone create variable radon potential. Limited testing data exists for this zip code 61466 community, making individual home assessment crucial. Homeowners in this western Illinois location should prioritize radon testing given the region's underlying geology and typical basement construction.

6.00

pCi/L area average

Above EPA Action Level

Mercer County average: 6.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for North Henderson 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+

North Henderson, 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 North Henderson, IL

No homeowner tests have been submitted for North Henderson 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
New Windsor	6.8 mi	6.00 pCi/L	1
Monmouth	15.9 mi	8.00 pCi/L	1
Knoxville	16.3 mi	8.00 pCi/L	1
Orion	18.7 mi	4.00 pCi/L	1
Coal Valley	23.1 mi	12.00 pCi/L	1
Moline	27.0 mi	5.00 pCi/L	1
Rock Island	27.4 mi	4.50 pCi/L	2
Geneseo	29.9 mi	6.00 pCi/L	1

Mercer County Radon Profile

Because of its underlying geology, Mercer County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Homeowner-submitted tests from 1 city in Mercer County average 6.00 pCi/L across 1 test — 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 Mercer County home regardless of zone or a neighbor's results.

Radon FAQ for North Henderson, IL

What EPA Radon Zone is North Henderson in?

North Henderson and the 61466 zip code are in Mercer 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 North Henderson?

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

Radon mitigation in North Henderson 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 North Henderson?

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.