Missouri Department of Health and Senior Services
Missouri radon (air)
No state license roster to republish. Updated 2026-09-06 (US/Pacific).
If you are not sure you need a pro yet, see when a DIY radon test kit is enough or how to test a home for radon.
Missouri DHSS does not publish a public statewide list of radon measurement or mitigation businesses and does not offer a state radon license lookup on its site. This page does not invent company names, phones, licenses, or addresses to fill that gap.
DHSS recommends selecting contractors certified by EPA-recognized credentialing bodies: NRPP or NRSB (the same organizations linked from DHSS radon testing and mitigation pages) and notes that lists of Missouri contractors certified by each organization are on those sites. Filter by measurement vs. mitigation, then re-check the credential before hiring.
What DHSS says homeowners can do
- Radon is a radioactive gas from uranium in soil. You cannot see or smell it — testing indoor air is the only way to know a building’s level.
- EPA’s long-term action level remains 4 pCi/L. DHSS advises taking action if confirmed results are above that level.
- Free short-term kits are offered to Missouri residents while supplies last (limit one per household). Request through the DHSS radon hub using coupon code MO TESTING.
- DHSS publishes interactive radon maps of past test results for context only — they are not a substitute for testing your own home.
- There are no Missouri laws that require radon testing or seller mitigation in a real-estate transaction; buyers and sellers often still test.
- Questions: Bureau of Environmental Epidemiology / 573-751-6102 or toll-free 866-628-9891; Radon@health.mo.gov.
Official sources
- Missouri DHSS — Radon Information (retrieved 2026-09-06)
- Missouri DHSS — Radon Testing (retrieved 2026-09-06)
- Missouri DHSS — Mitigation (retrieved 2026-09-06)
- NRPP Find a Pro (linked from DHSS for measurement and mitigation)
- NRSB find a professional (linked from DHSS for measurement and mitigation)
- U.S. EPA Radon
This index does not rank contractors or take referral fees. No Amazon kit links on this state page.