Rockford, IL Radon Levels

Q: What EPA Radon Zone is Rockford in?

Rockford is in Winnebago County, EPA Zone 1.

Q: How much does radon mitigation cost in Rockford?

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

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

Rockford, IL Radon Facts

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

County Winnebago County, IL

Zip Code 61101

As Winnebago County's largest city in the northwest suburban and exurban belt beyond the Chicago metro, Rockford sits on glacial till deposits from the Wisconsin glaciation that create soil conditions highly favorable for radon gas production. The city's diverse housing stock spans from early 1900s construction to modern subdivisions, with full basements standard throughout zip codes 61101-61114. Given the limited current testing data and the region's geological profile, homeowners should prioritize radon testing to establish safe indoor air quality.

6.40

pCi/L area average

Above EPA Action Level

Winnebago County average: 6.40 pCi/L, based on 5 user-submitted tests across 4 cities in the county. No homeowner readings have been submitted for Rockford 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+

Rockford, 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 Rockford, IL

No homeowner tests have been submitted for Rockford 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
Belvidere	10.4 mi	4.50 pCi/L	2
Roscoe	11.0 mi	5.50 pCi/L	2
Poplar Grove	12.5 mi	7.00 pCi/L	2
Stillman Valley	12.5 mi	5.00 pCi/L	1
Rockton	13.0 mi	6.00 pCi/L	1
Byron	14.5 mi	11.50 pCi/L	2
South Beloit	14.9 mi	4.00 pCi/L	1
Pecatonica	15.2 mi	11.00 pCi/L	1

Winnebago County Radon Profile

The bedrock and soils beneath Winnebago County are classified by the EPA as Radon Zone 1, the highest-risk tier, with predicted average indoor screening levels above 4 pCi/L. Homeowner-submitted tests from 4 cities in Winnebago County average 6.40 pCi/L across 5 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. 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 Winnebago County.

Radon FAQ for Rockford, IL

What EPA Radon Zone is Rockford in?

Rockford and the 61101 zip code are in Winnebago 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 Rockford?

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

Radon mitigation in Rockford 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 Rockford?

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.