Mount Vernon, IL Radon Levels

Q: What is the average radon level in Mount Vernon, IL?

Based on 1 user-submitted tests, the average radon level is 4.00 pCi/L.

Q: What EPA Radon Zone is Mount Vernon in?

Mount Vernon is in Jefferson County, EPA Zone 2.

Q: How much does radon mitigation cost in Mount Vernon?

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

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

Mount Vernon, IL Radon Facts

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

County Jefferson County, IL

Zip Code 62864

Avg. User Level 4.00 pCi/L

User Tests 1

This southern Illinois community in Jefferson County (zip code 62864) lies within the coal-bearing geological formations of the Illinois Basin. Although current radon testing submissions are limited, the area's Pennsylvanian-era shale and sandstone deposits can produce moderate radon levels in enclosed spaces. Regular testing remains important for homeowners, especially those with basements or lower-level living areas where radon gas typically accumulates.

4.00

pCi/L average

Above EPA Action Level

Based on 1 user-submitted radon test for homes in Mount Vernon, IL. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Mount Vernon, 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 Mount Vernon, IL

No homeowner tests have been submitted for Mount Vernon 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
Kell	13.7 mi	5.00 pCi/L	1
Carlyle	32.4 mi	13.00 pCi/L	1
Marion	40.9 mi	5.00 pCi/L	1
Murphysboro	44.5 mi	10.00 pCi/L	1
Campbell Hill	45.5 mi	1.00 pCi/L	1
Marissa	45.8 mi	4.00 pCi/L	1
Mascoutah	48.7 mi	6.50 pCi/L	2

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 Mount Vernon, IL

What is the average radon level in Mount Vernon, IL?

Based on 1 user-submitted test, the average radon level in Mount Vernon is 4.00 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Mount Vernon in?

Mount Vernon and the 62864 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.

How much does radon mitigation cost in Mount Vernon?

Radon mitigation in Mount Vernon 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 Mount Vernon?

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.