658 credentialed contractors across Iowa, Nebraska, Colorado and Kansas — sourced from each state’s official licensing, credentialing, or registration records, dated, and honest when the sample is thin.
No matching city on file yet — browse by state below.
155 contractors · 109 cities
Sourced from the Iowa HHS credential rosters, cross-checked against each company’s own site.
View Iowa directory79 contractors · 62 cities
Sourced from the Nebraska DHHS credential roster, cross-checked against each company’s own site.
View Nebraska directory357 contractors · 330 cities
Sourced from the Colorado DORA credential rosters, cross-checked against each company’s own site.
View Colorado directory67 contractors · 110 cities
Sourced from the Kansas KDHE credential rosters, cross-checked against each company’s own site.
View Kansas directoryState law requires every public school to test by July 1, 2027 and post the results on the district's own website. We checked each district's site and recorded what's there, with the date and a link to the source.
See all 25 districts →Every listing starts from a state’s own official radon credential records — never a scraped review site.
Each company is checked against its own site, Google, and Facebook to confirm it’s real and reachable.
Every listing shows when it was last checked — and a thin sample stays labeled thin, never rounded up.
This confirms a business is real, currently credentialed, and reachable — it is not an endorsement of workmanship.