Modesto, IL Radon Levels

Q: What EPA Radon Zone is Modesto in?

Modesto is in Macoupin County, EPA Zone 2.

Q: How much does radon mitigation cost in Modesto?

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

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

Modesto, IL Radon Facts

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

County Macoupin County, IL

Zip Code 62667

This small Macoupin County community sits within the St. Louis metropolitan influence zone, where underlying limestone bedrock can contribute to variable radon conditions. While specific testing data for the 62667 area is currently limited, the geological context suggests homeowners should conduct baseline radon measurements. Illinois EPA Zone 2 designation indicates moderate radon potential across this region.

8.50

pCi/L area average

Above EPA Action Level

Macoupin County average: 8.50 pCi/L, based on 2 user-submitted tests across 2 cities in the county. No homeowner readings have been submitted for Modesto 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+

Modesto, 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 Modesto, IL

No homeowner tests have been submitted for Modesto 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
Carlinville	14.3 mi	9.00 pCi/L	1
Auburn	14.9 mi	6.00 pCi/L	1
Divernon	18.1 mi	7.00 pCi/L	1
Chatham	19.8 mi	3.00 pCi/L	1
Jacksonville	22.2 mi	9.00 pCi/L	2
White Hall	22.8 mi	6.00 pCi/L	1
Springfield	27.8 mi	6.50 pCi/L	2
Jerseyville	31.0 mi	3.50 pCi/L	2

Macoupin County Radon Profile

EPA mapping assigns Macoupin 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 2 cities in Macoupin County average 8.50 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 Macoupin County home regardless of zone or a neighbor's results.

Radon FAQ for Modesto, IL

What EPA Radon Zone is Modesto in?

Modesto and the 62667 zip code are in Macoupin 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 Modesto?

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

Radon mitigation in Modesto 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 Modesto?

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.