Cottage Hills, IL Radon Levels

Q: What EPA Radon Zone is Cottage Hills in?

Cottage Hills is in Madison County, EPA Zone 2.

Q: How much does radon mitigation cost in Cottage Hills?

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

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

Cottage Hills, IL Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Madison County, IL

Zip Code 62018

Situated in Madison County as part of the St. Louis Metro area, Cottage Hills sits on Mississippi River floodplain deposits over limestone bedrock. Testing data for the 62018 zip code area is currently limited, making professional radon testing essential for residents. The community's position near river bluffs and underlying Mississippian limestone creates moderate radon potential that can vary significantly between individual properties.

5.44

pCi/L area average

Above EPA Action Level

Madison County average: 5.44 pCi/L, based on 9 user-submitted tests across 8 cities in the county. No homeowner readings have been submitted for Cottage Hills 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+

Cottage Hills, 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 Cottage Hills, IL

No homeowner tests have been submitted for Cottage Hills 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
East Alton	2.2 mi	4.00 pCi/L	1
Godfrey	7.0 mi	6.00 pCi/L	1
Glen Carbon	12.1 mi	2.50 pCi/L	2
Granite City	13.0 mi	8.00 pCi/L	1
Maryville	15.1 mi	11.00 pCi/L	1
Collinsville	16.7 mi	5.00 pCi/L	1
Troy	17.3 mi	4.00 pCi/L	1
Staunton	17.4 mi	8.00 pCi/L	1

Madison County Radon Profile

The soils and bedrock of Madison County place it in EPA Radon Zone 2, a moderate-risk classification with predicted indoor averages of 2 to 4 pCi/L. Homeowner-submitted tests from 8 cities in Madison County average 5.44 pCi/L across 9 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Madison County to test, as levels can differ between neighboring homes.

Radon FAQ for Cottage Hills, IL

What EPA Radon Zone is Cottage Hills in?

Cottage Hills and the 62018 zip code are in Madison County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

Why are radon readings shown from areas near Cottage Hills?

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

Radon mitigation in Cottage Hills 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 Cottage Hills?

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.