Dupo, IL Radon Levels

Q: What EPA Radon Zone is Dupo in?

Dupo is in St Clair County, EPA Zone 2.

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

No homeowner radon tests have been submitted for Dupo yet, so readings from the closest cities and the St Clair 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 Dupo?

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

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

Dupo, IL Radon Facts

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

County St Clair County, IL

Zip Code 62239

Situated in St. Clair County along the Mississippi River floodplain, Dupo occupies terrain where alluvial deposits over limestone bedrock can create moderate radon conditions that vary significantly from neighborhood to neighborhood. Testing data for zip code 62239 remains limited, encouraging St. Louis Metro residents to assess their homes through professional radon testing. The area's mix of older homes with basements and newer slab construction can experience different radon accumulation patterns.

7.50

pCi/L area average

Above EPA Action Level

St Clair County average: 7.50 pCi/L, based on 12 user-submitted tests across 7 cities in the county. No homeowner readings have been submitted for Dupo 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+

Dupo, 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 Dupo, IL

No homeowner tests have been submitted for Dupo 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
Columbia	5.8 mi	8.00 pCi/L	4
Belleville	11.7 mi	7.33 pCi/L	3
Fairview Heights	12.3 mi	9.00 pCi/L	1
Caseyville	13.4 mi	7.50 pCi/L	2
Waterloo	13.8 mi	9.20 pCi/L	5
Granite City	15.5 mi	8.00 pCi/L	1
Collinsville	16.8 mi	5.00 pCi/L	1
O Fallon	17.4 mi	6.00 pCi/L	1

St Clair County Radon Profile

EPA mapping assigns St Clair County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Homeowner-submitted tests from 7 cities in St Clair County average 7.50 pCi/L across 12 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 St Clair County home regardless of zone or a neighbor's results.

Radon FAQ for Dupo, IL

What EPA Radon Zone is Dupo in?

Dupo and the 62239 zip code are in St Clair 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 Dupo?

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

Radon mitigation in Dupo 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 Dupo?

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.