Gladstone, IL Radon Levels

Q: What EPA Radon Zone is Gladstone in?

Gladstone is in Henderson County, EPA Zone 1.

Q: How much does radon mitigation cost in Gladstone?

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

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

Gladstone, IL Radon Facts

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

County Henderson County, IL

Zip Code 61437

This small Henderson County community sits along the Mississippi River valley where alluvial deposits over limestone bedrock create moderate radon potential. With limited testing data available for the 61437 zip code, residents in older farmhouses with stone foundations should prioritize radon testing. The river valley's geological complexity means radon levels can vary significantly between neighboring properties.

13.00

pCi/L area average

Above EPA Action Level

Henderson County average: 13.00 pCi/L, based on 2 user-submitted tests across 1 city in the county. No homeowner readings have been submitted for Gladstone 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+

Gladstone, 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 Gladstone, IL

No homeowner tests have been submitted for Gladstone 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
Stronghurst	6.9 mi	13.00 pCi/L	2
Monmouth	18.9 mi	8.00 pCi/L	1
Dallas City	19.6 mi	9.00 pCi/L	1
Knoxville	37.3 mi	8.00 pCi/L	1
New Windsor	37.4 mi	6.00 pCi/L	1
Orion	48.2 mi	4.00 pCi/L	1
Cuba	48.6 mi	6.00 pCi/L	1
Coal Valley	49.6 mi	12.00 pCi/L	1

Henderson County Radon Profile

Because of its underlying geology, Henderson County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Homeowner-submitted tests from 1 city in Henderson County average 13.00 pCi/L across 2 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Henderson County home regardless of zone or a neighbor's results.

Radon FAQ for Gladstone, IL

What EPA Radon Zone is Gladstone in?

Gladstone and the 61437 zip code are in Henderson 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 Gladstone?

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

Radon mitigation in Gladstone 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 Gladstone?

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.