Modoc, IL Radon Levels

Q: What EPA Radon Zone is Modoc in?

Modoc is in Randolph County, EPA Zone 2.

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

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

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

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

Modoc, IL Radon Facts

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

County Randolph County, IL

Zip Code 62261

Positioned in Randolph County along the Mississippi River floodplain, Modoc benefits from alluvial deposits that generally moderate radon accumulation compared to areas with exposed limestone. Testing data for zip code 62261 remains sparse, encouraging residents to establish baseline readings through professional measurement. The community's rural character includes older farmsteads where foundation types can significantly influence indoor radon levels.

7.68

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 7.68 pCi/L, based on 22 tests from 10 nearby cities. No readings have been submitted for Modoc 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+

Modoc, 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 Modoc, IL

No homeowner tests have been submitted for Modoc 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
Marissa	19.8 mi	4.00 pCi/L	1
Waterloo	20.1 mi	9.20 pCi/L	5
Campbell Hill	25.4 mi	1.00 pCi/L	1
Columbia	28.3 mi	8.00 pCi/L	4
Mascoutah	31.8 mi	6.50 pCi/L	2
Belleville	33.4 mi	7.33 pCi/L	3
O Fallon	36.6 mi	6.00 pCi/L	1
Fairview Heights	37.7 mi	9.00 pCi/L	1

Randolph County Radon Profile

Randolph County is mapped as EPA Radon Zone 2, where the local geology is predicted to produce moderate indoor screening levels between 2 and 4 pCi/L. User-submitted readings are still sparse within Randolph County itself, so the nearby measurements shown on this page provide the closest real-world picture of local radon conditions. 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 Randolph County.

Radon FAQ for Modoc, IL

What EPA Radon Zone is Modoc in?

Modoc and the 62261 zip code are in Randolph 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 Modoc?

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

Radon mitigation in Modoc 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 Modoc?

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.