Granville, IL Radon Levels

Q: What EPA Radon Zone is Granville in?

Granville is in Putnam County, EPA Zone 1.

Q: How much does radon mitigation cost in Granville?

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

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

Granville, IL Radon Facts

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

County Putnam County, IL

Zip Code 61326

Situated in Putnam County along the Illinois River valley, Granville sits on alluvial soils combined with underlying Ordovician limestone that create variable radon conditions throughout this region. While specific radon data for zip code 61326 is currently limited, the area's geology suggests moderate to elevated radon potential. Homeowners in this river valley community should test for radon, particularly in homes with basements where radon from limestone bedrock can accumulate.

9.58

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 9.58 pCi/L, based on 12 tests from 10 nearby cities. No readings have been submitted for Granville yet, so the closest recorded data is shown as a benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Granville, 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 Granville, IL

No homeowner tests have been submitted for Granville 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
Spring Valley	4.5 mi	2.00 pCi/L	1
Peru	7.0 mi	6.50 pCi/L	2
Princeton	12.5 mi	11.50 pCi/L	2
Varna	16.0 mi	20.00 pCi/L	1
Streator	22.7 mi	7.00 pCi/L	1
Ancona	24.2 mi	20.00 pCi/L	1
Walnut	27.5 mi	5.00 pCi/L	1
Earlville	27.6 mi	11.00 pCi/L	1

Putnam County Radon Profile

Because of its underlying geology, Putnam County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Direct test data for Putnam County remains limited, so the closest neighboring readings are used here to represent the radon conditions homeowners are likely to encounter. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Putnam County home regardless of zone or a neighbor's results.

Radon FAQ for Granville, IL

What EPA Radon Zone is Granville in?

Granville and the 61326 zip code are in Putnam 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 Granville?

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

Radon mitigation in Granville 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 Granville?

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.