Gilson, IL Radon Levels

Q: What EPA Radon Zone is Gilson in?

Gilson is in Knox County, EPA Zone 1.

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

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

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

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

Gilson, IL Radon Facts

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

County Knox County, IL

Zip Code 61436

Positioned in Knox County within west-central Illinois, Gilson sits over Pennsylvanian-era bedrock formations that can contribute to radon production. The rural community in zip code 61436 features primarily older farmsteads and homes with traditional full basements common to the region. With limited testing data available and the area's EPA Zone 1 designation, local homeowners should conduct radon testing to assess their indoor air quality.

8.00

pCi/L area average

Above EPA Action Level

Knox County average: 8.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Gilson 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+

Gilson, 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 Gilson, IL

No homeowner tests have been submitted for Gilson 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
Knoxville	6.3 mi	8.00 pCi/L	1
Monmouth	24.7 mi	8.00 pCi/L	1
Cuba	26.1 mi	6.00 pCi/L	1
New Windsor	26.8 mi	6.00 pCi/L	1
Dunlap	28.0 mi	7.00 pCi/L	1
Kewanee	28.3 mi	8.00 pCi/L	1
Mapleton	30.1 mi	8.00 pCi/L	1
Peoria	31.2 mi	5.00 pCi/L	1

Knox County Radon Profile

The bedrock and soils beneath Knox 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 Knox County average 8.00 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 Knox County.

Radon FAQ for Gilson, IL

What EPA Radon Zone is Gilson in?

Gilson and the 61436 zip code are in Knox 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 Gilson?

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

Radon mitigation in Gilson 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 Gilson?

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.