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RADON411

Radon professionals in Missouri

Who tests and fixes radon in Missouri, what Missouri's own program says about licensing, and how to check a credential before you hire.

Updated October 2, 2026

Missouri at a glance

  • Share at 4+ pCi/L

    30.6%

    5.1 pts below U.S.

    Missouri
    30.6%
    U.S.
    35.7%

    58,525 tests across 115 counties, 2008 to 2017

  • Counties in EPA Zone 1

    11 of 115

    Some at highest potential

    Zone 1
    11
    Zone 2
    97

    EPA's predicted potential; Zone 1 is the highest

  • Counties with figures

    115

    Of 115 counties

    With figures
    115
    All
    115

    Reported tests on file, 2008 to 2017

Radon professionals listed for Missouri

None that Missouri licenses yet. The businesses below have an address here and another state licenses them.

No business licensed by Missouri is listed here yet.

Located in Missouri, licensed by another state

These businesses have an address in Missouri, and another state's registry lists them. That does not mean Missouri licenses them: check with Missouri's radon program before hiring one for work here.

27 professionals located in Missouri and listed by another state. Showing 1 to 1224.

On this page: 7 testing and mitigation, 2 mitigation, 315 testing

Testing and mitigation 7

Mitigation 2

Testing 315

Show 12 more on this page

By city

12 cities in Missouri with a listed business address.

Every radon business listed in Missouri, A to Z (27)

Short answer

Radon professionals in Missouri, in brief

No business that Missouri itself licenses or certifies is listed on Radon411 yet. Ask Missouri Radon Program what it requires before you hire.

27 businesses with an address in Missouri appear in a separate list because another state's registry lists them. That does not mean Missouri licenses them.

Radon levels

Read a radon result for Missouri

Before you call a professional: what EPA says about a test result, beside Missouri's own share of high tests.

Read a result for Missouri

Starts at EPA's action level

4.0pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 4.0 pCi/L

At or above 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. 30.6% of Missouri's reported tests reached 4 pCi/L, 2008 to 2017.

Interpret this readingWhat a fix costs

Radon levels in Missouri, county by county

The rule

Does Missouri license radon professionals?

Missouri's radon program page, checked on November 3, 2026, does not say whether the state licenses or certifies radon professionals. Ask the program before you hire.

Missouri is not on the list of states with radon credentialing programs that EPA's state contacts page publishes. Licensing is done by the state, not by the national programs, and EPA requires states that receive radon grants to give the public a list of only those providers credentialed by the state or by NRPP or NRSB.

State program

Missouri's radon program

The state's own radon program: the place to ask who may work in the state.

Missouri Radon Program

Missouri Department of Health and Senior Services

Its page covers free or discounted test kits.

Phone 573-751-6102 · Email radon@health.mo.gov

Visit the program's page (opens in a new tab)Read November 3, 2026

Nearby

Listed professionals in states next to Missouri

A business licensed in a neighboring state is licensed there, not necessarily in Missouri. Check Missouri's rule above before you hire one.

Before you hire

How to check a credential in Missouri

  1. Missouri's own list

    Start with Missouri's radon program. Licensing is done by the state, and most states can give you a list of radon service providers working there.

  2. NRPP's search

    The National Radon Proficiency Program's search finds its Certified Mitigation Specialists and Certified Measurement Professionals by area, by name, or by the 6-digit NRPP ID number a professional can give you.

  3. NRSB's search

    The National Radon Safety Board's search finds a professional in your area, or confirms that a named professional is NRSB certified.

  4. The ID card

    The programs usually issue a photo ID card showing the holder's qualifications and its expiry date. Ask to see it, and if in doubt, check with the body that issued it.

Hiring

Hiring in Missouri

A tester

Ask for the credential and ID card, how the test will be guarded against interference, and when the report will come. EPA recommends an independent, qualified tester for the test after a system is installed.

What a professional test involves

A mitigation contractor

Get more than one estimate, contact references, and ask for a written proposal and a contract before any work starts.

How to choose a contractor

Questions

Common questions about Missouri

Does Missouri require radon professionals to be licensed?

Missouri's radon program page, checked on November 3, 2026, does not say whether the state licenses or certifies radon professionals. Ask the program before you hire.

Missouri is not on the list of states with radon credentialing programs that EPA's state contacts page publishes.

How do I find a certified radon mitigator in Missouri?

No business is listed for mitigation in Missouri on Radon411 yet.

Your state radon program can help you find qualified professionals in the state, and NRPP and NRSB, the two national proficiency programs EPA names, each publish a search of the professionals they certify.

How to choose a mitigation contractor

Who tests for radon in Missouri?

No business is listed for radon measurement in Missouri on Radon411 yet.

A qualified radon tester is very often a home inspector, and your state radon office can give you its approved list of radon testing companies.

What a professional radon test involves

Does Missouri offer free or discounted radon test kits?

Missouri Radon Program's page, checked on November 3, 2026, says:

Free radon test kits are available for Missouri residents (limit one per household).

Free and discounted test kits by state

Is every business on this page licensed in Missouri?

No listing here is a license. The first list holds businesses Missouri's own registry lists, or that confirmed their own listing; each card names its source.

27 businesses with an address in Missouri appear in a separate list because another state's registry lists them. That does not mean Missouri licenses them.

How listings are verified. Run a radon business in Missouri? Get Featured.

Next steps

Where to go next