Winchester, IL Radon Levels

Q: What EPA Radon Zone is Winchester in?

Winchester is in Scott County, EPA Zone 1.

Q: How much does radon mitigation cost in Winchester?

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

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

Winchester, IL Radon Facts

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

County Scott County, IL

Zip Code 62694

Nestled in rural Scott County along the Illinois River valley, Winchester features a mix of historic farmhouses and newer homes built over limestone bedrock. Radon testing data remains limited for this small community in zip code 62694, making individual home testing particularly important. The underlying geology and older foundation types common in this area can create pathways for radon entry.

6.58

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 6.58 pCi/L, based on 12 tests from 10 nearby cities. No readings have been submitted for Winchester 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+

Winchester, 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 Winchester, IL

No homeowner tests have been submitted for Winchester 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
White Hall	14.1 mi	6.00 pCi/L	1
Jacksonville	14.6 mi	9.00 pCi/L	2
Griggsville	14.9 mi	4.00 pCi/L	1
Pittsfield	18.2 mi	5.00 pCi/L	1
Jerseyville	35.6 mi	3.50 pCi/L	2
Auburn	38.5 mi	6.00 pCi/L	1
Carlinville	39.6 mi	9.00 pCi/L	1
Chatham	40.3 mi	3.00 pCi/L	1

Scott County Radon Profile

Because of its underlying geology, Scott 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 Scott 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 Scott County home regardless of zone or a neighbor's results.

Radon FAQ for Winchester, IL

What EPA Radon Zone is Winchester in?

Winchester and the 62694 zip code are in Scott 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 Winchester?

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

Radon mitigation in Winchester 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 Winchester?

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.