TRC Environmental Corporation
Windsor, CT
Listed for: Laboratory
Verified: Pennsylvania state license
Professionals
Radon professionals in Connecticut
Who tests and fixes radon in Connecticut, what Connecticut's own program says about licensing, and how to check a credential before you hire.
Updated October 2, 2026
Short answer
Radon professionals in Connecticut, in brief
No business that Connecticut itself licenses or certifies is listed on Radon411 yet. Connecticut's radon program says the state does not license or certify radon professionals.
2 businesses with an address in Connecticut appear in a separate list because another state's registry lists them. That does not mean Connecticut licenses them.
The rule
Does Connecticut license radon professionals?
No. Connecticut's radon program page, checked on September 25, 2026, says:
The State of Connecticut does not license or otherwise certify radon professionals, however, the Radon Program maintains lists of nationally certified professionals...
EPA's state contacts page lists Connecticut among the states with radon credentialing programs. 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 Connecticut; Connecticut's radon program is the place to ask who works there.
State program
Connecticut's radon program
The state's own radon program: the place to ask who may work in the state.
Radon Program
Department of Public Health
Its page covers free or discounted test kits and who may test and fix radon in the state.
Phone (860) 509-7300 · Email DPH.RadonReports@ct.gov
Visit the program's page (opens in a new tab)Read September 25, 2026
The directory
Radon professionals listed for Connecticut
None that Connecticut licenses yet. The businesses below have an address here and another state licenses them.
No business licensed by Connecticut is listed here yet. Where Connecticut licenses radon professionals, its own list is the complete one.
Located in Connecticut, licensed by another state
These businesses have an address in Connecticut, and another state's registry lists them. That does not mean Connecticut licenses them: check with Connecticut's radon program before hiring one for work here.
2 professionals located in Connecticut and listed by another state.
Williamson, Kathleen - TRC Environ
Windsor, CT
Listed for: Laboratory
Verified: Pennsylvania state license
Nearby
Listed professionals in states next to Connecticut
A business licensed in a neighboring state is licensed there, not necessarily in Connecticut. Check Connecticut's rule above before you hire one.
Before you hire
How to check a credential in Connecticut
Connecticut's rule
Connecticut's radon program says the state does not license radon professionals, so ask for a national certification instead, and check it in the next two steps.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 Connecticut
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 Connecticut
- Does Connecticut require radon professionals to be licensed?
No. Connecticut's radon program page, checked on September 25, 2026, says.
EPA's state contacts page lists Connecticut among the states with radon credentialing programs.
The State of Connecticut does not license or otherwise certify radon professionals, however, the Radon Program maintains lists of nationally certified professionals...
- How do I find a certified radon mitigator in Connecticut?
No business is listed for mitigation in Connecticut 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 Connecticut?
No business is listed for radon measurement in Connecticut 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 Connecticut offer free or discounted radon test kits?
Radon Program's page, checked on September 25, 2026, says:
A part of the partnership includes providing LHDs free short-term radon in air test kits for distribution to community residents.
- How current are the Connecticut listings?
Radon411 reads no licensing list for Connecticut; Connecticut's radon program is the place to ask who works there.
- Is every business on this page licensed in Connecticut?
No listing here is a license. The first list holds businesses Connecticut's own registry lists, or that confirmed their own listing; each card names its source.
2 businesses with an address in Connecticut appear in a separate list because another state's registry lists them. That does not mean Connecticut licenses them.
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 Connecticut? Claim your listing.
Next steps