Short answer: the median radon test in Cambria County was 3.5 pCi/L (CDC, lab tests 2008 to 2017). That is under EPA’s action level of 4 pCi/L but in the 2 to 4 range where EPA suggests considering a fix. Because it is a median, many homes in the county tested higher.
How Cambria County compares
Cambria County’s median of 3.5 pCi/L ranks #40 of 67 Pennsylvania counties with CDC data. The middle Pennsylvania county median is 3.8 pCi/L, so Cambria County is below the state’s typical county. EPA puts the county in Zone 2, moderate potential on EPA’s map (predicted average indoor level 2 to 4 pCi/L).
These numbers come from tests homeowners and buyers chose to run, not a random survey. They show local risk; they cannot predict the level in your house.
Certified radon mitigation pros based in Cambria County
Each listing below appears on Pennsylvania DEP’s certified mitigation list dated September 1, 2026. We show the city on file and the DEP certification number so you can confirm it.
Keith Carpenter
Certified individual based in Johnstown, PA
PA DEP certified mitigationCertification #2037
Certified firms in neighboring counties
- Main Street Radon Remediation (Irwin, Westmoreland County)
- Restoration Contracting Services In (New Kensington, Westmoreland County)
Radon in counties next to Cambria
| County | Median pCi/L | EPA zone |
|---|---|---|
| Bedford, PA | 4.8 | Zone 1 (high) |
| Blair, PA | 3.5 | Zone 1 (high) |
| Clearfield, PA | 5.1 | Zone 1 (high) |
| Indiana, PA | 4.2 | Zone 1 (high) |
| Somerset, PA | 3.5 | Zone 2 (moderate) |
| Westmoreland, PA | 3.1 | Zone 1 (high) |
What to do in Cambria County
- Test your home. EPA recommends testing every home below the third floor, whatever the county average.
- Fix it at 4 pCi/L or higher. EPA also suggests considering a fix between 2 and 4 pCi/L.
- Use a certified pro. In Pennsylvania, radon mitigation for pay requires DEP certification. Check the number against the state list before you sign.
- Retest after the system is installed.
Sources
- County median radon levels and test counts: CDC Environmental Public Health Tracking Network, radon tests from labs, 10-year period 2008 to 2017 (ephtracking.cdc.gov).
- Radon zones: U.S. EPA Map of Radon Zones (epa.gov/radon).
- Certified mitigation firms and individuals: Pennsylvania DEP list of certified radon mitigation firms dated September 1, 2026 (PDF), checked October 24, 2026.
Home Hazard Answers is an independent site. We are not affiliated with or endorsed by EPA, CDC or any state agency. This page is general information, not medical advice. Found an error or want a listing corrected or removed? Use our contact page.