Potomac, IL Radon Levels

Q: What EPA Radon Zone is Potomac in?

Potomac is in Vermilion County, EPA Zone 1.

Q: How much does radon mitigation cost in Potomac?

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

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

Potomac, IL Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County Vermilion County, IL

Zip Code 61865

Potomac lies in east-central Illinois' Vermilion County, where deep glacial deposits over limestone bedrock contribute to the region's moderate-to-high radon potential. Testing data for zip code 61865 is currently limited, though the area's geological setting suggests elevated risk typical of central Illinois communities. Residents should prioritize professional radon testing, especially given the prevalence of full basements in local housing stock.

5.33

pCi/L area average

Above EPA Action Level

Vermilion County average: 5.33 pCi/L, based on 3 user-submitted tests across 1 city in the county. No homeowner readings have been submitted for Potomac 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+

Potomac, 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 Potomac, IL

No homeowner tests have been submitted for Potomac 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
Gifford	11.0 mi	10.00 pCi/L	1
Danville	14.5 mi	5.33 pCi/L	3
Paxton	17.7 mi	4.00 pCi/L	1
Homer	20.3 mi	20.00 pCi/L	1
Urbana	24.3 mi	15.00 pCi/L	1
Champaign	27.0 mi	6.67 pCi/L	3
Mahomet	31.0 mi	5.00 pCi/L	1
Ashkum	40.2 mi	19.00 pCi/L	1

Vermilion County Radon Profile

Because of its underlying geology, Vermilion County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Homeowner-submitted tests from 1 city in Vermilion County average 5.33 pCi/L across 3 tests — 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 Vermilion County home regardless of zone or a neighbor's results.

Radon FAQ for Potomac, IL

What EPA Radon Zone is Potomac in?

Potomac and the 61865 zip code are in Vermilion County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

Why are radon readings shown from areas near Potomac?

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

Radon mitigation in Potomac 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 Potomac?

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.