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RADON411

Radon professionals in Colorado

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

Updated October 2, 2026

Colorado at a glance

  • Businesses listed

    23

    16th of 20 states

    Colorado
    23
    Ohio
    478

    On Colorado's own list, or claimed there

  • Listed for mitigation

    23

    100% of listings

    Mitigation
    23
    Testing
    0

    A business can be listed for both

  • Share at 4+ pCi/L

    47.0%

    11.3 pts above U.S.

    Colorado
    47.0%
    U.S.
    35.7%

    96,367 tests across 63 counties, 2008 to 2017

  • Counties in EPA Zone 1

    53 of 64

    Most at highest potential

    Zone 1
    53
    Zone 2
    11

    EPA's predicted potential; Zone 1 is the highest

Radon professionals listed for Colorado

23 professionals in Colorado. Showing 1 to 1223.

Show 11 more on this page

Located in Colorado, licensed by another state

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

2 professionals located in Colorado and listed by another state.

By city

10 cities in Colorado with a listed business address.

Every radon business listed in Colorado, A to Z (25)

Short answer

Radon professionals in Colorado, in brief

Radon411 lists 23 radon businesses for Colorado: 0 listed for radon measurement (testing) and 23 for mitigation. Colorado's radon program says the state licenses or certifies radon professionals.

Radon levels

Read a radon result for Colorado

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

Read a result for Colorado

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. 47.0% of Colorado's reported tests reached 4 pCi/L, 2008 to 2017.

Interpret this readingWhat a fix costs

Radon levels in Colorado, county by county

The rule

Does Colorado license radon professionals?

Yes. Colorado's radon program page, checked on November 3, 2026, says:

Listed contractors are certified by the National Radon Proficiency Program or the National Radon Safety Board, and must be licensed by the Colorado Department of Regulatory Agencies.
Colorado Department of Public Health and Environment, read November 3, 2026

EPA's state contacts page lists Colorado 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.

The Colorado Department of Regulatory Agencies, Office of Radon Professionals publishes its list of licensed radon professionals, last read on November 3, 2026. It names individual people, not businesses, and Radon411 lists businesses only, so no one on it is listed here. To check a person's license, use the state's own list.

State program

Colorado's radon program

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

Colorado Department of Public Health and Environment

Its page covers free or discounted test kits, who may test and fix radon in the state and the disclosure rule for home sales.

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

Nearby

Listed professionals in states next to Colorado

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

Before you hire

How to check a credential in Colorado

  1. Colorado's own list

    Start with the Colorado Department of Regulatory Agencies, Office of Radon Professionals. Licensing is done by the state, so its list or search says who may legally work in Colorado.

  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 Colorado

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

23 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 Colorado

Does Colorado require radon professionals to be licensed?

Yes. Colorado's radon program page, checked on November 3, 2026, says.

EPA's state contacts page lists Colorado among the states with radon credentialing programs.

Listed contractors are certified by the National Radon Proficiency Program or the National Radon Safety Board, and must be licensed by the Colorado Department of Regulatory Agencies.
How do I find a certified radon mitigator in Colorado?

Radon411 lists 23 businesses for mitigation in Colorado, 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 ColoradoHow to choose a mitigation contractor

Who tests for radon in Colorado?

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

Colorado Department of Public Health and Environment's page, checked on November 3, 2026, says:

Order a discounted radon test kit

Free and discounted test kits by state

Does Colorado have a radon disclosure rule for home sales?

Colorado Department of Public Health and Environment's page, checked on November 3, 2026, says:

As of August 7, 2023, landlords in Colorado are required to disclose radon information when a tenant signs a lease agreement.

Every state's program, licensing and disclosure rule

How current are the Colorado listings?

The Colorado Department of Regulatory Agencies, Office of Radon Professionals publishes its list of licensed radon professionals, last read on November 3, 2026. It names individual people, not businesses, and Radon411 lists businesses only, so no one on it is listed here. To check a person's license, use the state's own list.

Is every business on this page licensed in Colorado?

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

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

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

Next steps

Where to go next