EPA Zone 1-2 (High Risk)☢️ Avg: 8.6 pCi/L

Radon Testing & Mitigation in Philadelphia, Pennsylvania

The Philadelphia metro area — including Montgomery, Chester, Bucks, and Delaware counties — sits in Pennsylvania's high-radon corridor. While Philadelphia proper has mixed radon levels, the surrounding suburban counties consistently test among the highest in the nation, making the broader metro a prime market for radon services.

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Avg Radon Level

8.6 pCi/L

EPA action: 4.0 pCi/L

EPA Zone

Zone 1-2

Highest Risk

Metro Population

6.2 million

Service area

Avg Mitigation

$1,200 – $2,800

Installed cost

Avg Testing

$150 – $450

Professional test

Radon Facts for Philadelphia, PA

1Chester and Montgomery counties have some of the highest radon readings in Pennsylvania
2The Reading Prong geological formation running through the suburbs is a major radon source
3PA's Radon Certification Act ensures only licensed professionals can mitigate
4The massive suburban footprint means millions of homes potentially affected
5PA DEP provides free test kits and maintains a database of certified radon professionals

🏠 Philadelphia Housing Stock

Enormous suburban sprawl with colonial and split-level homes, deep basements, and stone foundations — classic radon entry conditions

📋 Real Estate & Radon Disclosure

Pennsylvania's disclosure requirements and the Philadelphia suburbs' competitive real estate market make radon testing nearly universal in home transactions.

Why Philadelphia Homes Need Radon Testing

With average radon levels of 8.6 pCi/L in the Philadelphia metro area — well above the EPA’s recommended action level of 4.0 pCi/L — professional radon testing isn’t optional, it’s essential.

Radon inspector testing a home in Philadelphia

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Very High Local Levels

Philadelphia’s average of 8.6 pCi/L means a significant percentage of homes exceed the EPA action level. The only way to know your home’s level is to test.

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Local Housing Factors

Philadelphia’s housing stock — enormous suburban sprawl with colonial and split-level homes, deep basements, and stone foundations — classic radon entr… — creates conditions where radon can enter and accumulate.

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Pennsylvania Disclosure Laws

Pennsylvania's disclosure requirements and the Philadelphia suburbs' competitive real estate market make radon testing nearly universal in home transactions.… Proactive testing protects both buyers and sellers.

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Family Health Risk

Radon is the #2 cause of lung cancer in the US, responsible for 21,000 deaths annually. Long-term exposure in a high-radon area like Philadelphia increases risk significantly.

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Affordable Protection

Testing costs just $150 – $450 and mitigation averages $1,200 – $2,800 in Philadelphia — a small price for your family’s safety and your home’s value.

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