Allentown, PA Radon Levels

Q: What EPA Radon Zone is Allentown in?

Allentown is in Lehigh County, EPA Zone 1.

Q: How much does radon mitigation cost in Allentown?

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

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

Allentown, PA Radon Facts

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

County Lehigh County, PA

Zip Code 18101

As the largest city in Lehigh County and center of the Allentown Metro area, this community sits within Pennsylvania's high radon potential zone. While comprehensive testing data across the city's multiple zip codes remains limited, the area's geological foundation of limestone and shale formations creates favorable conditions for radon production. Professional testing is strongly recommended for all residential properties throughout the greater Allentown area.

7.25

pCi/L area average

Above EPA Action Level

Lehigh County average: 7.25 pCi/L, based on 4 user-submitted tests across 4 cities in the county. No homeowner readings have been submitted for Allentown 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+

Allentown, 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 Allentown, PA

No homeowner tests have been submitted for Allentown 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
Center Valley	6.3 mi	11.00 pCi/L	1
Breinigsville	8.2 mi	6.00 pCi/L	1
Coopersburg	9.1 mi	7.00 pCi/L	1
Hellertown	9.9 mi	13.00 pCi/L	1
Slatington	10.8 mi	5.00 pCi/L	1
Bath	12.0 mi	14.00 pCi/L	1
Quakertown	13.9 mi	5.00 pCi/L	1
Nazareth	14.2 mi	20.00 pCi/L	2

Lehigh County Radon Profile

Because of its underlying geology, Lehigh 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 4 cities in Lehigh County average 7.25 pCi/L across 4 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 Lehigh County home regardless of zone or a neighbor's results.

Radon FAQ for Allentown, PA

What EPA Radon Zone is Allentown in?

Allentown and the 18101 zip code are in Lehigh 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 Allentown?

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

Radon mitigation in Allentown 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 Allentown?

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.