Harrisburg, IL Radon Levels

Q: What EPA Radon Zone is Harrisburg in?

Harrisburg is in Saline County, EPA Zone 2.

Q: How much does radon mitigation cost in Harrisburg?

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

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

Harrisburg, IL Radon Facts

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

County Saline County, IL

Zip Code 62946

Located in Saline County within southern Illinois, Harrisburg sits on Pennsylvanian-era coal measures and shale deposits that generally produce moderate radon levels in the region. The city's housing stock spans from early 1900s architecture to modern developments, with many homes featuring full or partial basements typical of Illinois construction practices. Given the absence of current testing data for zip code 62946, homeowners should consider radon testing to assess their individual property conditions.

6.33

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 6.33 pCi/L, based on 3 tests from 3 nearby cities. No readings have been submitted for Harrisburg yet, so the closest recorded data is shown as a benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Harrisburg, 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 Harrisburg, IL

No homeowner tests have been submitted for Harrisburg 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
Marion	21.1 mi	5.00 pCi/L	1
Murphysboro	43.1 mi	10.00 pCi/L	1
Mount Vernon	45.5 mi	4.00 pCi/L	1

Saline County Radon Profile

The soils and bedrock of Saline County place it in EPA Radon Zone 2, a moderate-risk classification with predicted indoor averages of 2 to 4 pCi/L. Few homeowner tests have been logged inside Saline County so far, which is why this page draws on the nearest recorded readings to illustrate regional radon levels. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Saline County to test, as levels can differ between neighboring homes.

Radon FAQ for Harrisburg, IL

What EPA Radon Zone is Harrisburg in?

Harrisburg and the 62946 zip code are in Saline 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 Harrisburg?

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

Radon mitigation in Harrisburg 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 Harrisburg?

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.