Radon in zip code 19152

Most homes tested here were below the EPA action level, but 1 in 23 were at or above it.

68%28%

653 home tests, 2016–2026

The line marks the EPA action level, 4 pCi/L.

What to do next

Test your home
Radon levels vary between neighboring houses, so area data can't tell you your own home's level. A short-term test takes 2 to 7 days in the lowest lived-in floor. A long-term test (90 days or more) gives a more reliable average.
If your result is 4 pCi/L or more, fix it
A certified professional installs a sub-slab system: a pipe and a quiet fan that pull radon from under the foundation and vent it above the roof. It usually takes a day; the costs are above.
It works: across Pennsylvania, the typical level dropped from 7.7 to 1.0 pCi/L after mitigation, and 95% of homes ended up below the action level.
Use a certified professional
Pennsylvania requires radon testers and mitigators to be certified. The state publishes the list of certified mitigation firms by county.

Share of home tests at or above 4 pCi/L, 2016–2026.

EPA Map of Radon Zones (public domain).
Pennsylvania Department of Environmental Protection, radon test results and mitigation register via data.pa.gov (public domain). Test records don't say whether a test was taken before or after mitigation.