Herrin, IL Radon Levels

Q: What EPA Radon Zone is Herrin in?

Herrin is in Williamson County, EPA Zone 2.

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

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

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

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

Herrin, IL Radon Facts

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

County Williamson County, IL

Zip Code 62948

Part of Williamson County in southern Illinois's coal belt region, Herrin sits where Pennsylvanian-era coal measures and shale deposits create generally moderate radon conditions. Testing data for the 62948 community remains limited, though professional radon measurements are recommended. The area's coal mining history and underlying geological formations make baseline testing valuable for homeowners.

5.00

pCi/L area average

Above EPA Action Level

Williamson County average: 5.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Herrin 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+

Herrin, 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 Herrin, IL

No homeowner tests have been submitted for Herrin 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	7.3 mi	5.00 pCi/L	1
Murphysboro	17.0 mi	10.00 pCi/L	1
Campbell Hill	31.5 mi	1.00 pCi/L	1
Mount Vernon	36.1 mi	4.00 pCi/L	1
Kell	49.6 mi	5.00 pCi/L	1
Marissa	50.0 mi	4.00 pCi/L	1

Williamson County Radon Profile

EPA mapping assigns Williamson 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 Williamson County average 5.00 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 Williamson County home regardless of zone or a neighbor's results.

Radon FAQ for Herrin, IL

What EPA Radon Zone is Herrin in?

Herrin and the 62948 zip code are in Williamson 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 Herrin?

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

Radon mitigation in Herrin 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 Herrin?

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.