Humboldt, IL Radon Levels

Q: What EPA Radon Zone is Humboldt in?

Humboldt is in Coles County, EPA Zone 1.

Q: How much does radon mitigation cost in Humboldt?

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

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

Humboldt, IL Radon Facts

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

County Coles County, IL

Zip Code 61931

This Coles County community in east-central Illinois occupies EPA Zone 1 territory where radon testing data remains developing. The region's glacial moraine deposits over limestone bedrock contribute to moderate radon potential across the central Illinois prairie. Local homeowners in the 61931 zip code area should consider professional radon measurement to establish their property's baseline levels.

9.00

pCi/L area average

Above EPA Action Level

Coles County average: 9.00 pCi/L, based on 4 user-submitted tests across 2 cities in the county. No homeowner readings have been submitted for Humboldt 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+

Humboldt, 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 Humboldt, IL

No homeowner tests have been submitted for Humboldt 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
Mattoon	9.0 mi	9.33 pCi/L	3
Charleston	10.8 mi	8.00 pCi/L	1
Tuscola	13.8 mi	17.00 pCi/L	1
Shelbyville	28.0 mi	17.00 pCi/L	1
Monticello	32.3 mi	4.50 pCi/L	2
Paris	32.8 mi	9.67 pCi/L	3
Urbana	34.6 mi	15.00 pCi/L	1
Homer	35.3 mi	20.00 pCi/L	1

Coles County Radon Profile

Because of its underlying geology, Coles 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 2 cities in Coles County average 9.00 pCi/L across 4 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 Coles County home regardless of zone or a neighbor's results.

Radon FAQ for Humboldt, IL

What EPA Radon Zone is Humboldt in?

Humboldt and the 61931 zip code are in Coles 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 Humboldt?

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

Radon mitigation in Humboldt 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 Humboldt?

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.