Chapter 01
Certified radon testers & mitigators
Current credentials for radon testing and mitigation in the United States. Each listing shows a credential number, the issuing body, the date we last checked the official file, and a link to that file. This is a directory, not a contractor. EPA does not certify radon contractors.
Opens a city or county we already publish.
Or open a place from a file we import:
4,812current listings
50states with listings
1,236cities and counties
Latest credential check. Individual record dates may be earlier. Methodology
Chapter 02
Cities and counties with the most listings
Chapter 03
States with current listings
Who credentials radon work in each state, and where to verify a number, is tabulated in radon credentials by state.
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- District of Columbia
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
The homeowner’s reference
Before you book, and after the work
Read the homeowner guides for testing timelines, system maintenance and when to retest.