What should you do about your radon result?
How does this work?
Enter your result in pCi/L and pick which test it was. The answer follows EPA's testing steps as PA DEP publishes them, and EPA's 4 pCi/L action level. It can't see your home, so talk to a certified company about anything specific.
Why does the type of test matter?
Radon changes from day to day and season to season. A short-term test is less likely than a long-term test to show your year-round average. That's why EPA asks for a follow-up test before you decide to fix, unless the first result is very high.
Radon Result FAQs
What should I do if my first radon test is high?
EPA says to take a follow-up test to be sure: a long-term test for your year-round average, or a second short-term test if you need results quickly. If the first result is more than twice the 4 pCi/L action level, take a second short-term test right away.
Is any radon level safe?
EPA believes any radon exposure carries some risk. Even levels below 4 pCi/L pose some risk, and lowering your level lowers your risk of lung cancer.
Sources
- PA DEP: Pennsylvania Citizen's Guide to Radon (2900-BK-DEP0375)
- PA DEP: Pennsylvania Consumer's Guide to Radon Reduction
- PA DEP fact sheet: Radon Mitigation Systems (2940-FS-DEP4430)
- US EPA: Map of Radon Zones and action levels
Page last updated Sep 2026.