Seneca, PA Radon Levels

Q: What EPA Radon Zone is Seneca in?

Seneca is in Venango County, EPA Zone 1.

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

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

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

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

Seneca, PA Radon Facts

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

County Venango County, PA

Zip Code 16346

This small Venango County community sits within Pennsylvania's oil region, where Devonian shale and sandstone bedrock can produce variable radon levels depending on local geological conditions. Housing includes older oil-boom era structures and farmsteads, many with stone or concrete block basements typical of early-to-mid 20th century construction. With limited testing data in zip code 16346, residents should consider radon testing to understand their individual risk given the area's complex geological setting.

5.00

pCi/L area average

Above EPA Action Level

Venango County average: 5.00 pCi/L, based on 2 user-submitted tests across 2 cities in the county. No homeowner readings have been submitted for Seneca 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+

Seneca, 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 Seneca, PA

No homeowner tests have been submitted for Seneca 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
Cranberry	4.4 mi	1.00 pCi/L	1
Franklin	8.3 mi	9.00 pCi/L	1
Fryburg	13.6 mi	4.00 pCi/L	1
Parker	18.9 mi	20.00 pCi/L	1
Karns City	25.8 mi	20.00 pCi/L	1
Grove City	25.8 mi	9.00 pCi/L	2
Brookville	34.2 mi	8.00 pCi/L	3
Saegertown	34.5 mi	9.00 pCi/L	1

Venango County Radon Profile

The bedrock and soils beneath Venango County are classified by the EPA as Radon Zone 1, the highest-risk tier, with predicted average indoor screening levels above 4 pCi/L. Homeowner-submitted tests from 2 cities in Venango County average 5.00 pCi/L across 2 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Radon is the second leading cause of lung cancer in the United States, and a short-term test is the only way to confirm a specific home's level in Venango County.

Radon FAQ for Seneca, PA

What EPA Radon Zone is Seneca in?

Seneca and the 16346 zip code are in Venango 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 Seneca?

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

Radon mitigation in Seneca 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 Seneca?

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.