Professionals
Radon professionals in Washington
Who tests and fixes radon in Washington, what Washington's own program says about licensing, and how to check a credential before you hire.
Updated October 2, 2026
Short answer
Radon professionals in Washington, in brief
No business that Washington itself licenses or certifies is listed on Radon411 yet. Ask Radon Program what it requires before you hire.
The rule
Does Washington license radon professionals?
Washington's radon program page, checked on September 25, 2026, does not say whether the state licenses or certifies radon professionals. Ask the program before you hire.
Washington 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.
Radon411 reads no licensing list for Washington; Washington's radon program is the place to ask who works there.
State program
Washington's radon program
The state's own radon program: the place to ask who may work in the state.
Radon Program
Washington State Department of Health
Its page covers free or discounted test kits.
Phone 360-236-3200 · Email doh.radon@doh.wa.gov
Visit the program's page (opens in a new tab)Read September 25, 2026
The directory
Radon professionals listed for Washington
No radon business is listed for Washington yet. Ask Radon Program for its list, and check any professional in the steps below. Run a radon business in Washington? Ask to be listed.
Before you hire
How to check a credential in Washington
Washington's own list
Start with Washington's radon program. Licensing is done by the state, and most states can give you a list of radon service providers working there.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.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.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 Washington
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.
A mitigation contractor
Get more than one estimate, contact references, and ask for a written proposal and a contract before any work starts.
Questions
Common questions about Washington
- Does Washington require radon professionals to be licensed?
Washington's radon program page, checked on September 25, 2026, does not say whether the state licenses or certifies radon professionals. Ask the program before you hire.
Washington 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 Washington?
No business is listed for mitigation in Washington 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.
- Who tests for radon in Washington?
No business is listed for radon measurement in Washington 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.
- Does Washington offer free or discounted radon test kits?
Radon Program's page, checked on September 25, 2026, says:
We have a limited supply of free radon test kits.
- How current are the Washington listings?
Radon411 reads no licensing list for Washington; Washington's radon program is the place to ask who works there.
- Is every business on this page licensed in Washington?
No listing here is a license. The first list holds businesses Washington's own registry lists, or that confirmed their own listing; each card names its source.
Before you hire, check the business against Washington's own list or the issuing body's search, because a listing on Radon411 is not a credential.
No business pays to be listed, labelled or placed higher here, and Radon411 sells no leads. How listings are verified. Run a radon business in Washington? Claim your listing.
Next steps