Radon in zip code 17851
Most homes tested here were below the EPA action level, but 1 in 11 were at or above it.
- Below 2 pCi/L: 71%
- 2 to 4 pCi/L: 20%
- 4 pCi/L or more: 9%
- Median level
- 1.3 pCi/L
- County
- Northumberland County
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.
How 17851 compares
Share of home tests at or above 4 pCi/L, 2016–2026.
| Zip 17851 | 9% | |
|---|---|---|
| Northumberland County | 37% | |
| Pennsylvania | 30% |
Sources
- 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.
Last updated October 2026. How we calculate these numbers.