Colfax, IL Radon Levels

Q: What EPA Radon Zone is Colfax in?

Colfax is in McLean County, EPA Zone 1.

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

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

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

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

Colfax, IL Radon Facts

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

County McLean County, IL

Zip Code 61728

Situated in McLean County within the Bloomington metro region, Colfax lies on deep glacial deposits over limestone bedrock that characterize central Illinois's elevated radon potential. Although specific testing data for the 61728 area is limited, the geological conditions strongly suggest homeowners should conduct radon testing. The community's mix of traditional homes with full basements and rural properties means radon accumulation patterns can vary significantly throughout the area.

8.50

pCi/L area average

Above EPA Action Level

McLean County average: 8.50 pCi/L, based on 8 user-submitted tests across 3 cities in the county. No homeowner readings have been submitted for Colfax 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+

Colfax, 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 Colfax, IL

No homeowner tests have been submitted for Colfax 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
Fairbury	13.2 mi	4.00 pCi/L	1
Le Roy	17.1 mi	5.00 pCi/L	1
Normal	19.7 mi	7.25 pCi/L	4
Pontiac	21.2 mi	10.50 pCi/L	2
Bloomington	21.3 mi	11.33 pCi/L	3
Mahomet	28.5 mi	5.00 pCi/L	1
Paxton	28.5 mi	4.00 pCi/L	1
Ancona	35.0 mi	20.00 pCi/L	1

McLean County Radon Profile

McLean County falls in EPA Radon Zone 1, meaning the local uranium-bearing geology is predicted to drive average indoor radon screening levels above the EPA's 4 pCi/L action threshold. Homeowner-submitted tests from 3 cities in McLean County average 8.50 pCi/L across 8 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 McLean County to test, as levels can differ between neighboring homes.

Radon FAQ for Colfax, IL

What EPA Radon Zone is Colfax in?

Colfax and the 61728 zip code are in McLean 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 Colfax?

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

Radon mitigation in Colfax 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 Colfax?

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.