Williamsburg, PA Radon Levels

Q: What EPA Radon Zone is Williamsburg in?

Williamsburg is in Blair County, EPA Zone 1.

Q: How much does radon mitigation cost in Williamsburg?

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

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

Williamsburg, PA Radon Facts

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

County Blair County, PA

Zip Code 16693

Williamsburg sits in Blair County, nestled within Pennsylvania's Appalachian region where limestone and sandstone bedrock create variable radon conditions. Testing data for the 16693 zip code area remains limited, making professional radon testing essential for homeowners. Given Pennsylvania's designation as a high-radon state, residents should prioritize testing regardless of home age or foundation type.

7.40

pCi/L area average

Above EPA Action Level

Blair County average: 7.40 pCi/L, based on 5 user-submitted tests across 4 cities in the county. No homeowner readings have been submitted for Williamsburg 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+

Williamsburg, PA 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 Williamsburg, PA

No homeowner tests have been submitted for Williamsburg 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
James Creek	4.7 mi	20.00 pCi/L	1
Hollidaysburg	6.4 mi	7.00 pCi/L	1
Martinsburg	8.3 mi	15.00 pCi/L	1
Duncansville	9.7 mi	3.00 pCi/L	1
Altoona	10.8 mi	6.00 pCi/L	2
Huntingdon	14.9 mi	20.00 pCi/L	1
Houtzdale	30.1 mi	14.00 pCi/L	2
Schellsburg	32.0 mi	20.00 pCi/L	1

Blair County Radon Profile

Blair County falls in EPA Radon Zone 1, meaning the local uranium-bearing geology is predicted to drive average indoor radon screening levels above the EPA's 4 pCi/L action threshold. Homeowner-submitted tests from 4 cities in Blair County average 7.40 pCi/L across 5 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Blair County to test, as levels can differ between neighboring homes.

Radon FAQ for Williamsburg, PA

What EPA Radon Zone is Williamsburg in?

Williamsburg and the 16693 zip code are in Blair 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 Williamsburg?

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

Radon mitigation in Williamsburg 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 Williamsburg?

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.