Harleysville, PA Radon Levels

Q: What EPA Radon Zone is Harleysville in?

Harleysville is in Montgomery County, EPA Zone 1.

Q: How much does radon mitigation cost in Harleysville?

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

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

Harleysville, PA Radon Facts

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

County Montgomery County, PA

Zip Code 19438

Nestled in Montgomery County within the Philadelphia Metro, Harleysville's proximity to Reading Prong geological formations and mix of older colonial-era homes with modern suburban developments creates variable radon potential. While specific testing data for the 19438 zip code area is currently limited, the region's complex geology makes professional radon assessment particularly important for homeowners.

8.41

pCi/L area average

Above EPA Action Level

Montgomery County average: 8.41 pCi/L, based on 17 user-submitted tests across 16 cities in the county. No homeowner readings have been submitted for Harleysville 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+

Harleysville, 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 Harleysville, PA

No homeowner tests have been submitted for Harleysville 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
Hatfield	4.9 mi	6.00 pCi/L	1
Lansdale	5.3 mi	3.00 pCi/L	1
Sellersville	7.6 mi	6.00 pCi/L	1
North Wales	7.7 mi	7.00 pCi/L	1
Pennsburg	10.1 mi	9.00 pCi/L	1
Ambler	10.8 mi	4.00 pCi/L	1
Gilbertsville	11.3 mi	5.00 pCi/L	1
King Of Prussia	11.8 mi	7.00 pCi/L	1

Montgomery County Radon Profile

Because of its underlying geology, Montgomery 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 16 cities in Montgomery County average 8.41 pCi/L across 17 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 Montgomery County home regardless of zone or a neighbor's results.

Radon FAQ for Harleysville, PA

What EPA Radon Zone is Harleysville in?

Harleysville and the 19438 zip code are in Montgomery 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 Harleysville?

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

Radon mitigation in Harleysville 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 Harleysville?

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.