Saint Thomas, PA Radon Levels

Q: What EPA Radon Zone is Saint Thomas in?

Saint Thomas is in Franklin County, EPA Zone 1.

Q: How much does radon mitigation cost in Saint Thomas?

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

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

Saint Thomas, PA Radon Facts

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

County Franklin County, PA

Zip Code 17252

Located in Franklin County within the Chambersburg Metro area, Saint Thomas sits in Pennsylvania's south-central region where limestone bedrock creates elevated radon potential. Testing data for this 17252 zip code community remains limited, making professional radon testing essential for homeowners. Given the area's geological conditions and EPA Zone 1 classification, residents should prioritize radon assessment to ensure safe indoor air quality.

8.50

pCi/L area average

Above EPA Action Level

Franklin County average: 8.50 pCi/L, based on 14 user-submitted tests across 5 cities in the county. No homeowner readings have been submitted for Saint Thomas 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+

Saint Thomas, 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 Saint Thomas, PA

No homeowner tests have been submitted for Saint Thomas 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
Chambersburg	7.6 mi	10.14 pCi/L	7
Mercersburg	9.5 mi	6.50 pCi/L	2
Greencastle	10.1 mi	9.00 pCi/L	1
Mc Connellsburg	10.7 mi	8.00 pCi/L	1
Fayetteville	13.8 mi	7.00 pCi/L	3
Waynesboro	16.2 mi	5.00 pCi/L	1
Orrtanna	21.9 mi	20.00 pCi/L	1
Fairfield	24.8 mi	7.50 pCi/L	2

Franklin County Radon Profile

Because of its underlying geology, Franklin 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 5 cities in Franklin County average 8.50 pCi/L across 14 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 Franklin County home regardless of zone or a neighbor's results.

Radon FAQ for Saint Thomas, PA

What EPA Radon Zone is Saint Thomas in?

Saint Thomas and the 17252 zip code are in Franklin 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 Saint Thomas?

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

Radon mitigation in Saint Thomas 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 Saint Thomas?

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.