Find a radon tester near you.
868 local businesses that test homes for radon, in 48 states and DC. Each one checked against its own website and Google listing.
Browse by state
- Alabama 4
- Arizona 8
- California 7
- Colorado 56
- Connecticut 43
- Delaware 4
- District of Columbia 3
- Florida 3
- Georgia 16
- Hawaii 1
- Idaho 8
- Illinois 40
- Indiana 29
- Iowa 12
- Kansas 12
- Kentucky 19
- Louisiana 1
- Maine 15
- Maryland 37
- Massachusetts 23
- Michigan 21
- Minnesota 36
- Mississippi 1
- Missouri 13
- Montana 10
- Nebraska 12
- Nevada 2
- New Hampshire 25
- New Jersey 37
- New Mexico 6
- New York 70
- North Carolina 20
- North Dakota 9
- Ohio 65
- Oklahoma 1
- Oregon 8
- Pennsylvania 58
- Rhode Island 13
- South Carolina 11
- South Dakota 1
- Tennessee 11
- Texas 8
- Utah 19
- Vermont 5
- Virginia 31
- Washington 4
- West Virginia 6
- Wisconsin 19
- Wyoming 5
Why test
- Radon is the leading cause of lung cancer among people who don't smoke.
- It causes about 21,000 lung cancer deaths in the US every year.
- You can't see or smell it. A test is the only way to know your level. The EPA says to fix a home at 4 pCi/L or higher.
Source: US EPA, Health Risk of Radon.
Questions about radon testing
How many radon testers are in the US?
radon.directory lists 868 radon testers in the US in 582 cities. Each one says on its own website that it tests for radon and has an open Google Business Profile, checked in October 2026.
What kinds of businesses test for radon in the US?
Of the 868 businesses listed: 364 home inspectors; 357 radon companies that test and fix radon; 91 other businesses that test for radon; 56 radon testing companies. Radon specialists often also fix high levels; home inspectors usually test during a home sale.
How do I choose a radon tester?
The EPA suggests your state radon program as the place to find qualified professionals, and says states list only providers credentialed by a state license or by one of the two national programs, the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB). Ask a tester which credential they hold. Source.
What radon level needs fixing?
The EPA says to fix your home if the radon level is 4 pCi/L or more, and to consider fixing it between 2 and 4 pCi/L. Source.
Should I get a short-term or long-term radon test?
A short-term test takes a few days and is a quick way to screen a home. A long-term test runs at least 91 days and shows your average level over the year. A high short-term result is usually followed by a second test before deciding to fix. Source.
Can I test for radon myself?
Yes. The EPA notes that test kits are sold online and in home improvement stores, and that some states offer free or discounted kits. A professional test is common when buying or selling a home. Source.