Radon Testing in Illinois
322 licensed companies across Illinois · state license records checked November 1, 2026
Radon Testing by city
- Chicago, IL216 companies
- Naperville, IL12 companies
- Rockford, IL10 companies
- Elgin, IL8 companies
- Springfield, IL5 companies
- Peoria, IL13 companies
- Champaign, IL4 companies
- Bloomington, IL6 companies
- Decatur, IL3 companies
- Urbana, ILnone listed yet
- Kankakee, IL5 companies