Professionals
Radon professionals in Guam
Who tests and fixes radon in Guam, what Guam's own program says about licensing, and how to check a credential before you hire.
Updated October 2, 2026
Short answer
Radon professionals in Guam, in brief
No business that Guam itself licenses or certifies is listed on Radon411 yet. Ask Guam's radon program what it requires before you hire.
The rule
Does Guam license radon professionals?
Radon411 holds no checked reading of Guam's radon program page yet, so this page states no licensing rule for Guam. Ask the program before you hire.
Guam 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 Guam; Guam's radon program is the place to ask who works there.
State program
Guam's radon program
The state's own radon program: the place to ask who may work in the state.
Radon411 has not checked Guam's radon program page yet, so it states nothing about the program here.
The directory
Radon professionals listed for Guam
No radon business is listed for Guam yet. Ask Guam's radon program for its list, and check any professional in the steps below. Run a radon business in Guam? Ask to be listed.
Before you hire
How to check a credential in Guam
Guam's own list
Start with Guam'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 Guam
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 Guam
- Does Guam require radon professionals to be licensed?
Radon411 holds no checked reading of Guam's radon program page yet, so this page states no licensing rule for Guam. Ask the program before you hire.
Guam 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 Guam?
No business is listed for mitigation in Guam 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 Guam?
No business is listed for radon measurement in Guam 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.
- How current are the Guam listings?
Radon411 reads no licensing list for Guam; Guam's radon program is the place to ask who works there.
- Is every business on this page licensed in Guam?
No listing here is a license. The first list holds businesses Guam's own registry lists, or that confirmed their own listing; each card names its source.
Before you hire, check the business against Guam'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 Guam? Claim your listing.
Next steps