Flat Rock, IL Radon Levels

Q: What EPA Radon Zone is Flat Rock in?

Flat Rock is in Crawford County, EPA Zone 2.

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

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

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

Flat Rock, IL Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Crawford County, IL

Zip Code 62427

Located in Crawford County in southeastern Illinois, Flat Rock sits over Pennsylvanian-era coal measures and sedimentary deposits characteristic of the Illinois Basin. While testing data for zip code 62427 remains limited, the underlying geology suggests generally moderate radon conditions. However, individual home testing is recommended as radon levels can vary significantly even within similar geological areas.

18.50

pCi/L area average

Above EPA Action Level

Crawford County average: 18.50 pCi/L, based on 2 user-submitted tests across 1 city in the county. No homeowner readings have been submitted for Flat Rock 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+

Flat Rock, 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 Flat Rock, IL

No homeowner tests have been submitted for Flat Rock 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
Palestine	7.4 mi	18.50 pCi/L	2
Bridgeport	14.7 mi	5.00 pCi/L	1
Mount Carmel	34.7 mi	5.00 pCi/L	2
Charleston	47.8 mi	8.00 pCi/L	1
Paris	48.6 mi	9.67 pCi/L	3
Effingham	49.3 mi	4.33 pCi/L	3

Crawford County Radon Profile

Crawford County is mapped as EPA Radon Zone 2, where the local geology is predicted to produce moderate indoor screening levels between 2 and 4 pCi/L. Homeowner-submitted tests from 1 city in Crawford County average 18.50 pCi/L across 2 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 Crawford County.

Radon FAQ for Flat Rock, IL

What EPA Radon Zone is Flat Rock in?

Flat Rock and the 62427 zip code are in Crawford County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

Why are radon readings shown from areas near Flat Rock?

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

Radon mitigation in Flat Rock 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 Flat Rock?

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.