Shannon, IL Radon Levels

Q: What EPA Radon Zone is Shannon in?

Shannon is in Carroll County, EPA Zone 1.

Q: How much does radon mitigation cost in Shannon?

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

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

Shannon, IL Radon Facts

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

County Carroll County, IL

Zip Code 61078

Shannon sits in Carroll County in northwestern Illinois, where limited testing data is available for this rural community in the 61078 zip code area. The region's glacial till deposits over limestone bedrock create geological conditions favorable for radon production and migration into homes. Despite the current lack of comprehensive local data, the area's EPA Zone 1 designation makes radon testing essential for homeowners.

12.00

pCi/L area average

Above EPA Action Level

Carroll County average: 12.00 pCi/L, based on 3 user-submitted tests across 1 city in the county. No homeowner readings have been submitted for Shannon 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+

Shannon, 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 Shannon, IL

No homeowner tests have been submitted for Shannon 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
Lanark	6.1 mi	12.00 pCi/L	3
Freeport	11.2 mi	3.67 pCi/L	3
Mount Morris	17.9 mi	4.00 pCi/L	1
Orangeville	22.2 mi	14.00 pCi/L	1
Pecatonica	22.8 mi	11.00 pCi/L	1
Byron	24.8 mi	11.50 pCi/L	2
Dixon	25.4 mi	14.00 pCi/L	2
Davis	26.1 mi	8.00 pCi/L	1

Carroll County Radon Profile

Because of its underlying geology, Carroll 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 1 city in Carroll County average 12.00 pCi/L across 3 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 Carroll County home regardless of zone or a neighbor's results.

Radon FAQ for Shannon, IL

What EPA Radon Zone is Shannon in?

Shannon and the 61078 zip code are in Carroll 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 Shannon?

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

Radon mitigation in Shannon 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 Shannon?

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.