Bonnie, IL Radon Levels

Q: What EPA Radon Zone is Bonnie in?

Bonnie is in Jefferson County, EPA Zone 2.

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

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

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

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

Bonnie, IL Radon Facts

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

County Jefferson County, IL

Zip Code 62816

Small Jefferson County sits on Pennsylvanian-era coal measures and shale deposits in the Illinois Basin that create generally moderate radon conditions. While testing data for the 62816 area is currently limited, residents should conduct individual home testing given the area's geological characteristics. The rural community features scattered older homes and farmsteads, many with partial basements or crawl spaces where radon accumulation patterns can vary significantly from property to property.

4.00

pCi/L area average

Above EPA Action Level

Jefferson County average: 4.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Bonnie 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+

Bonnie, 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 Bonnie, IL

No homeowner tests have been submitted for Bonnie 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
Mount Vernon	8.2 mi	4.00 pCi/L	1
Kell	21.9 mi	5.00 pCi/L	1
Marion	32.6 mi	5.00 pCi/L	1
Murphysboro	37.3 mi	10.00 pCi/L	1
Carlyle	37.6 mi	13.00 pCi/L	1
Campbell Hill	40.5 mi	1.00 pCi/L	1
Marissa	45.0 mi	4.00 pCi/L	1

Jefferson County Radon Profile

EPA mapping assigns Jefferson County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Homeowner-submitted tests from 1 city in Jefferson County average 4.00 pCi/L across 1 test — 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 Jefferson County home regardless of zone or a neighbor's results.

Radon FAQ for Bonnie, IL

What EPA Radon Zone is Bonnie in?

Bonnie and the 62816 zip code are in Jefferson 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 Bonnie?

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

Radon mitigation in Bonnie 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 Bonnie?

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.