Bethlehem, PA Radon Levels

Q: What EPA Radon Zone is Bethlehem in?

Bethlehem is in Northampton County, EPA Zone 1.

Q: How much does radon mitigation cost in Bethlehem?

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

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

Bethlehem, PA Radon Facts

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

County Northampton County, PA

Zip Code 18015

Part of the Allentown Metro area in Lehigh County, Bethlehem sits on geological formations that contribute to Pennsylvania's elevated radon potential. With limited testing data available for the 18018 zip code, homeowners should prioritize radon testing given the region's geology. The area's mix of older homes with stone foundations and newer construction creates varied radon entry pathways.

13.64

pCi/L area average

Above EPA Action Level

Northampton County average: 13.64 pCi/L, based on 11 user-submitted tests across 5 cities in the county. No homeowner readings have been submitted for Bethlehem 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+

Bethlehem, 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 Bethlehem, PA

No homeowner tests have been submitted for Bethlehem 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
Hellertown	6.0 mi	13.00 pCi/L	1
Bath	7.3 mi	14.00 pCi/L	1
Nazareth	7.6 mi	20.00 pCi/L	2
Center Valley	7.8 mi	11.00 pCi/L	1
Easton	8.5 mi	12.33 pCi/L	6
Coopersburg	9.9 mi	7.00 pCi/L	1
Slatington	13.1 mi	5.00 pCi/L	1
Quakertown	14.7 mi	5.00 pCi/L	1

Northampton County Radon Profile

Because of its underlying geology, Northampton 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 Northampton County average 13.64 pCi/L across 11 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 Northampton County home regardless of zone or a neighbor's results.

Radon FAQ for Bethlehem, PA

What EPA Radon Zone is Bethlehem in?

Bethlehem and the 18015 zip code are in Northampton 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 Bethlehem?

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

Radon mitigation in Bethlehem 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 Bethlehem?

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.