Chapter 01
Radon mitigation contractors and testers | US & Canada
Find radon mitigation contractors and radon testers 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 that state’s list, narrowed to the nearest city or county on file.
Or open a whole state list:
6,647current US listings
50US states with listings + DC
1,952US cities and counties
Latest US credential check. Individual record dates may be earlier. Methodology
Chapter 02
US states and DC with current listings
Who credentials radon work in each state, and where to verify a number, is tabulated in radon credentials by state.
- Alabamatesting 28 · mitigation 9
- Alaskatesting 7 · mitigation 2
- Arizonatesting 31 · mitigation 7
- Arkansastesting 5 · mitigation 4
- Californiatesting 201 · mitigation 12
- Coloradotesting 547 · mitigation 232
- Connecticuttesting 69 · mitigation 37
- Delawaretesting 8 · mitigation 3
- District of Columbiatesting 3
- Floridatesting 46 · mitigation 11
- Georgiatesting 81 · mitigation 23
- Hawaiitesting 9 · mitigation 1
- Idahotesting 17 · mitigation 9
- Illinoistesting 485 · mitigation 138
- Indianatesting 318 · mitigation 87
- Iowatesting 194 · mitigation 108
- Kansastesting 228 · mitigation 63
- Kentuckytesting 93 · mitigation 46
- Louisianatesting 2
- Mainetesting 101 · mitigation 33
- Marylandtesting 131 · mitigation 26
- Massachusettstesting 76 · mitigation 27
- Michigantesting 61 · mitigation 50
- Minnesotatesting 366 · mitigation 113
- Mississippitesting 1
- Missouritesting 58 · mitigation 15
- Montanatesting 22 · mitigation 20
- Nebraskatesting 95 · mitigation 43
- Nevadatesting 27 · mitigation 3
- New Hampshiretesting 19 · mitigation 20
- New Jerseytesting 72 · mitigation 9
- New Mexicotesting 14 · mitigation 7
- New Yorktesting 120 · mitigation 43
- North Carolinatesting 101 · mitigation 50
- North Dakotatesting 9 · mitigation 12
- Ohiotesting 77 · mitigation 35
- Oklahomatesting 14 · mitigation 4
- Oregontesting 41 · mitigation 17
- Pennsylvaniatesting 612 · mitigation 239
- Rhode Islandtesting 25 · mitigation 6
- South Carolinatesting 15 · mitigation 7
- South Dakotatesting 9 · mitigation 8
- Tennesseetesting 58 · mitigation 42
- Texastesting 66 · mitigation 9
- Utahtesting 34 · mitigation 37
- Vermonttesting 13 · mitigation 7
- Virginiatesting 323 · mitigation 50
- Washingtontesting 24 · mitigation 8
- West Virginiatesting 47 · mitigation 10
- Wisconsintesting 64 · mitigation 64
- Wyomingtesting 7 · mitigation 7
The homeowner’s reference
Before you book, and after the work
Read the homeowner guides for testing timelines, system maintenance and when to retest.