Henry, IL Radon Levels

Q: What EPA Radon Zone is Henry in?

Henry is in Marshall County, EPA Zone 1.

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

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

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

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

Henry, IL Radon Facts

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

County Marshall County, IL

Zip Code 61537

Henry is located in Marshall County along the Illinois River valley, where alluvial soils and underlying limestone bedrock create variable radon conditions throughout the Peoria Metro region. The community features housing from different eras, including older homes with full basements typical of central Illinois. With limited specific radon testing data for the 61537 area, local homeowners should conduct testing to determine their individual property's radon levels.

20.00

pCi/L area average

Above EPA Action Level

Marshall County average: 20.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Henry 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+

Henry, 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 Henry, IL

No homeowner tests have been submitted for Henry 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
Varna	8.5 mi	20.00 pCi/L	1
Spring Valley	17.4 mi	2.00 pCi/L	1
Princeton	17.6 mi	11.50 pCi/L	2
Peru	20.0 mi	6.50 pCi/L	2
Metamora	22.8 mi	7.50 pCi/L	2
Dunlap	23.1 mi	7.00 pCi/L	1
Ancona	27.0 mi	20.00 pCi/L	1
Streator	28.3 mi	7.00 pCi/L	1

Marshall County Radon Profile

The bedrock and soils beneath Marshall County are classified by the EPA as Radon Zone 1, the highest-risk tier, with predicted average indoor screening levels above 4 pCi/L. Homeowner-submitted tests from 1 city in Marshall County average 20.00 pCi/L across 1 test — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Radon is the second leading cause of lung cancer in the United States, and a short-term test is the only way to confirm a specific home's level in Marshall County.

Radon FAQ for Henry, IL

What EPA Radon Zone is Henry in?

Henry and the 61537 zip code are in Marshall 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 Henry?

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

Radon mitigation in Henry 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 Henry?

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.