Chapter 01
Certified radon testers & mitigators
Find radon testing and mitigation professionals in the United States and Canada. Each listing shows a credential number, the issuing body, the date we last checked the official source, and a link to that source.
Search the United States
Opens a city or county we already publish.
Or open a place from a file we import:
6,341current US listings
51US states with listings
1,837US cities and counties
Latest US credential check. Individual record dates may be earlier. Methodology
Chapter 02
US cities and counties with the most listings
Chapter 03
US 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
- Delaware
- 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.