How to Use This Tool
- Find your result on your lab report. Look for a number labeled "Average," "Radon Concentration," or "Result" in pCi/L. If your report shows WL (Working Levels), multiply by 200 to get an approximate pCi/L equivalent.
- Select your state. Permit requirements and contractor licensing rules differ by state. Selecting your state gives you accurate local guidance instead of generic national information.
- Note your test type. Short-term tests (2–7 days) are snapshots — they may read higher or lower than your true annual average. Long-term tests (90+ days) are more reliable. This affects whether a confirmatory re-test is needed.
- Review your results. The tool gives you: EPA action level assessment, your state's permit rules, contractor certification requirements, and a prioritized next-step checklist.
What This Tool Covers
EPA Action Level
Assesses whether your result is below, near, or above the 4 pCi/L EPA action level — and what that means for urgency of response.
State Permit Notes
Whether your state requires a building permit, when an electrical permit applies, and who to call to confirm local requirements.
Contractor Licensing
Whether your state requires a certified mitigator, which certification bodies to check, and how to verify a contractor before hiring.
Next Steps
Prioritized action checklist tailored to your result level — from "re-test before acting" to "contact a contractor this week."
This Tool Is a Starting Point
The guidance here is based on EPA national standards and state-level policy information as of May 2025. Always verify current permit requirements with your local building department and consult a certified radon professional for decisions specific to your home.
Frequently Asked Questions About This Tool
Enter the center value or stated average — in this case approximately 4.2 pCi/L. Some lab reports include an uncertainty range (±). The stated result is the center of that range and is the value used for decision-making. If your report shows a range rather than a single number, use the midpoint.
Select "Other / Not Listed." The tool will give you EPA-based guidance and direct you to the national NRPP and NRSB contractor databases. For state-specific permit information, contact your state radon office — a directory is available at epa.gov/radon/state-radon-offices-and-contacts.
No. This tool provides general educational guidance based on EPA standards and state policy information. It is not a substitute for a professional assessment of your specific home. For installation design, post-mitigation testing, and official documentation, always use a certified radon professional.
Disclaimer: This tool provides general guidance based on EPA standards and state policy information current as of May 2025. It does not constitute professional advice. Requirements may change. Always verify with your local building department and a certified radon professional.