Hennepin, IL Radon Levels

Q: What EPA Radon Zone is Hennepin in?

Hennepin is in Putnam County, EPA Zone 1.

Q: How much does radon mitigation cost in Hennepin?

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

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

Hennepin, IL Radon Facts

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

County Putnam County, IL

Zip Code 61327

This Putnam County community along the Illinois River valley currently lacks comprehensive radon testing data for local assessment. The area's alluvial soils over limestone bedrock create geological conditions that can produce variable radon levels between neighboring properties. Illinois River valley communities often experience radon readings that differ significantly from state averages, making individual home testing essential for accurate exposure evaluation.

9.23

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 9.23 pCi/L, based on 13 tests from 10 nearby cities. No readings have been submitted for Hennepin 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+

Hennepin, 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 Hennepin, IL

No homeowner tests have been submitted for Hennepin 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	8.8 mi	2.00 pCi/L	1
Princeton	10.4 mi	11.50 pCi/L	2
Peru	12.2 mi	6.50 pCi/L	2
Varna	14.5 mi	20.00 pCi/L	1
Walnut	25.8 mi	5.00 pCi/L	1
Streator	26.7 mi	7.00 pCi/L	1
Ancona	27.3 mi	20.00 pCi/L	1
Kewanee	31.5 mi	8.00 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 Hennepin, IL

What EPA Radon Zone is Hennepin in?

Hennepin and the 61327 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 Hennepin?

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

Radon mitigation in Hennepin 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 Hennepin?

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.