Wenona, IL Radon Levels

Q: What EPA Radon Zone is Wenona in?

Wenona is in Marshall County, EPA Zone 1.

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

No homeowner radon tests have been submitted for Wenona 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 Wenona?

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

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

Wenona, IL Radon Facts

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

County Marshall County, IL

Zip Code 61377

Small Wenona sits in Marshall County along the Illinois River valley, where alluvial soils over Ordovician limestone create variable radon conditions that can differ significantly between neighboring properties. Testing data for zip code 61377 is currently unavailable, but the geological setting suggests homeowners should conduct assessments. River valley communities often experience unpredictable radon patterns.

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 Wenona 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+

Wenona, 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 Wenona, IL

No homeowner tests have been submitted for Wenona 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
Ancona	9.3 mi	20.00 pCi/L	1
Varna	10.9 mi	20.00 pCi/L	1
Streator	11.9 mi	7.00 pCi/L	1
Peru	19.7 mi	6.50 pCi/L	2
Spring Valley	20.7 mi	2.00 pCi/L	1
Pontiac	24.6 mi	10.50 pCi/L	2
Marseilles	26.2 mi	9.00 pCi/L	1
Metamora	27.6 mi	7.50 pCi/L	2

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 Wenona, IL

What EPA Radon Zone is Wenona in?

Wenona and the 61377 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 Wenona?

No homeowner radon tests have been submitted for Wenona 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 Wenona 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 Wenona?

Radon mitigation in Wenona 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 Wenona?

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.