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RADON411

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

Connecticut at a glance

  • Businesses listed

    67

    10th of 20 states

    CT
    67
    Ohio
    478

    On Connecticut's own list, or claimed there

  • Listed for testing

    56

    84% of listings

    Testing
    56
    Mitigation
    30

    A business can be listed for both

  • Share at 4+ pCi/L

    26.7%

    9.1 pts below U.S.

    CT
    26.7%
    U.S.
    35.8%

    25,634 tests across 8 counties, 2007 to 2016

  • Counties in EPA Zone 1

    4 of 8

    Most at highest potential

    Zone 1
    4
    Zone 2
    3

    EPA's predicted potential; Zone 1 is the highest

Radon professionals listed for Connecticut

67 professionals in Connecticut. Showing 1 to 1224.

On this page: 7 testing and mitigation, 4 mitigation, 113 testing

Testing and mitigation 7

Mitigation 4

Testing 113

Show 12 more on this page

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.

Licensed in another state, serving Connecticut

These businesses are based in another state, that state's registry lists them, and they name Connecticut as a service area. That does not mean Connecticut licenses them: check with Connecticut's radon program before hiring one for work here.

2 professionals serving Connecticut from another state.

By city

The 12 of 50 Connecticut cities with the most listings. Search for any other, or open the full list.

View all 50 cities in Connecticut
Every radon business listed in Connecticut, A to Z (66)

Short answer

Radon professionals in Connecticut, in brief

Radon411 lists 67 radon businesses for Connecticut: 56 listed for radon measurement (testing), 30 for mitigation and 19 of them for both. Connecticut's radon program says the state does not license or certify radon professionals.

Radon levels

Read a radon result for Connecticut

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

Read a result for Connecticut

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. 26.7% of Connecticut's reported tests reached 4 pCi/L, 2007 to 2016.

Interpret this readingWhat a fix costs

Radon levels in Connecticut, county by county

The rule

Does Connecticut license radon professionals?

No. Connecticut's radon program page, checked on November 3, 2026, says:

The State of Connecticut does not license or otherwise certify radon professionals, however, the Radon Program maintains lists of nationally certified professionals in accordance with the requirements of CGS § 19a-14b (5)(b).
Radon Program, read November 3, 2026

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.

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 November 3, 2026

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

  1. 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.

  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 Connecticut

A tester

56 businesses are listed for testing here. 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

30 businesses are listed for mitigation here. 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 Connecticut

Does Connecticut require radon professionals to be licensed?

No. Connecticut's radon program page, checked on November 3, 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 in accordance with the requirements of CGS § 19a-14b (5)(b).
How do I find a certified radon mitigator in Connecticut?

Radon411 lists 30 businesses for mitigation in Connecticut, each with the source that lists it.

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.

Mitigation listings for ConnecticutHow to choose a mitigation contractor

Who tests for radon in Connecticut?

Radon411 lists 56 businesses for radon measurement in Connecticut.

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.

Testing listings for ConnecticutWhat a professional radon test involves

Does Connecticut offer free or discounted radon test kits?

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

A part of the partnership includes providing LHDs free short-term radon in air test kits for distribution to community residents.

Free and discounted test kits by state

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.

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

Next steps

Where to go next