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RADON411

Radon professionals in Maryland

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

Updated October 2, 2026

Radon professionals listed for Maryland

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

No business licensed by Maryland is listed here yet.

Located in Maryland, licensed by another state

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

5 professionals located in Maryland and listed by another state.

On this page: 2 mitigation, 3 testing

Mitigation 2

Testing 3

By city

4 cities in Maryland with a listed business address.

Every radon business listed in Maryland, A to Z (5)

Short answer

Radon professionals in Maryland, in brief

No business that Maryland itself licenses or certifies is listed on Radon411 yet. Ask Maryland Department of Health what it requires before you hire.

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

The rule

Does Maryland license radon professionals?

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

Maryland 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

Maryland's radon program

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

Maryland Department of Health

Its page covers free or discounted test kits.

Phone 1-866-703-3266

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

Nearby

Listed professionals in states next to Maryland

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

Before you hire

How to check a credential in Maryland

  1. Maryland's own list

    Start with Maryland'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 Maryland

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 Maryland

Does Maryland require radon professionals to be licensed?

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

Maryland 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 Maryland?

No business is listed for mitigation in Maryland 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 Maryland?

No business is listed for radon measurement in Maryland 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 Maryland offer free or discounted radon test kits?

Maryland Department of Health's page, checked on October 3, 2026, says:

Maryland residents may be eligible for a free radon test kit.

Free and discounted test kits by state

Is every business on this page licensed in Maryland?

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

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

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

Next steps

Where to go next