Rock City, IL Radon Levels

Q: What EPA Radon Zone is Rock City in?

Rock City is in Stephenson County, EPA Zone 1.

Q: How much does radon mitigation cost in Rock City?

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

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

Rock City, IL Radon Facts

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

County Stephenson County, IL

Zip Code 61070

Rock City in Stephenson County sits within northwestern Illinois' glacial till region, positioned in EPA Zone 1 where Wisconsin glaciation deposits over limestone bedrock create high radon potential. The 61070 area features rural residential properties with housing typical of northern Illinois agricultural communities, many with full basement foundations common to the region. Testing data is currently limited, making radon testing essential for homeowners given the area's elevated geological risk factors.

6.60

pCi/L area average

Above EPA Action Level

Stephenson County average: 6.60 pCi/L, based on 5 user-submitted tests across 3 cities in the county. No homeowner readings have been submitted for Rock City 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+

Rock City, 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 Rock City, IL

No homeowner tests have been submitted for Rock City 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
Davis	4.2 mi	8.00 pCi/L	1
Orangeville	9.6 mi	14.00 pCi/L	1
Pecatonica	9.8 mi	11.00 pCi/L	1
Freeport	11.2 mi	3.67 pCi/L	3
Rockton	20.0 mi	6.00 pCi/L	1
Byron	22.2 mi	11.50 pCi/L	2
South Beloit	23.3 mi	4.00 pCi/L	1
Roscoe	24.6 mi	5.50 pCi/L	2

Stephenson County Radon Profile

Because of its underlying geology, Stephenson 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 3 cities in Stephenson County average 6.60 pCi/L across 5 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 Stephenson County home regardless of zone or a neighbor's results.

Radon FAQ for Rock City, IL

What EPA Radon Zone is Rock City in?

Rock City and the 61070 zip code are in Stephenson 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 Rock City?

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

Radon mitigation in Rock City 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 Rock City?

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.