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RADON411

Radon professionals in Pennsylvania

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

Updated October 2, 2026

Pennsylvania at a glance

  • Businesses listed

    147

    6th of 20 states

    PA
    147
    Ohio
    478

    On Pennsylvania's own list, or claimed there

  • Listed for testing

    125

    85% of listings

    Testing
    125
    Mitigation
    49

    20 laboratories listed as well

  • State license on file

    147

    100% of listings

    State license
    147
    NRPP
    1

    As each issuer's own record shows it

  • Share at 4+ pCi/L

    41.7%

    6.0 pts above U.S.

    PA
    41.7%
    U.S.
    35.7%

    203,045 tests across 67 counties, 2008 to 2017

  • Counties in EPA Zone 1

    49 of 67

    Most at highest potential

    Zone 1
    49
    Zone 2
    17

    EPA's predicted potential; Zone 1 is the highest

Radon professionals listed for Pennsylvania

147 professionals in Pennsylvania. Showing 1 to 1224.

On this page: 4 testing and mitigation, 5 mitigation, 315 testing

Testing and mitigation 4

Mitigation 5

Testing 315

Show 12 more on this page

Located in Pennsylvania, licensed by another state

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

4 professionals located in Pennsylvania and listed by another state.

On this page: 2 mitigation, 2 testing

Mitigation 2

Testing 2

By city

The 12 of 89 Pennsylvania cities with the most listings. Search for any other, or open the full list.

View all 89 cities in Pennsylvania
Every radon business listed in Pennsylvania, A to Z (119)

Short answer

Radon professionals in Pennsylvania, in brief

Radon411 lists 147 radon businesses for Pennsylvania: 125 listed for radon measurement (testing), 49 for mitigation, 31 of them for both and 20 laboratories. Pennsylvania's radon program says the state licenses or certifies radon professionals.

Radon levels

Read a radon result for Pennsylvania

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

Read a result for Pennsylvania

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. 41.7% of Pennsylvania's reported tests reached 4 pCi/L, 2008 to 2017.

Interpret this readingWhat a fix costs

Radon levels in Pennsylvania, county by county

The rule

Does Pennsylvania license radon professionals?

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

The Radon Certification Act requires DEP to establish by regulation, a certification program for persons conducting radon gas and radon progeny testing, laboratory analysis and mitigation of radon contamination in buildings.
Radon Division, read November 3, 2026

EPA's state contacts page lists Pennsylvania 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.

Listings for Pennsylvania come from the list of licensed radon professionals that the Pennsylvania Department of Environmental Protection, Bureau of Radiation Protection publishes, last read on November 3, 2026, and from businesses that confirm their own details through Radon411's claim process.

State program

Pennsylvania's radon program

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

Radon Division

Department of Environmental Protection

Its page covers free or discounted test kits and who may test and fix radon in the state.

Phone 800-237-2366

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

Nearby

Listed professionals in states next to Pennsylvania

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

Before you hire

How to check a credential in Pennsylvania

  1. Pennsylvania's own list

    Start with the Pennsylvania Department of Environmental Protection, Bureau of Radiation Protection. Licensing is done by the state, so its list or search says who may legally work in Pennsylvania.

  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 Pennsylvania

A tester

125 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

49 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 Pennsylvania

Does Pennsylvania require radon professionals to be licensed?

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

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

The Radon Certification Act requires DEP to establish by regulation, a certification program for persons conducting radon gas and radon progeny testing, laboratory analysis and mitigation of radon contamination in buildings.
How do I find a certified radon mitigator in Pennsylvania?

Radon411 lists 49 businesses for mitigation in Pennsylvania, 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 PennsylvaniaHow to choose a mitigation contractor

Who tests for radon in Pennsylvania?

Radon411 lists 125 businesses for radon measurement in Pennsylvania.

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 PennsylvaniaWhat a professional radon test involves

Does Pennsylvania offer free or discounted radon test kits?

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

Through an EPA-funded program, hospitals give parents of newborn children a packet of information which includes a coupon for a free radon test kit from the DEP.

Free and discounted test kits by state

How current are the Pennsylvania listings?

Listings for Pennsylvania come from the list of licensed radon professionals that the Pennsylvania Department of Environmental Protection, Bureau of Radiation Protection publishes, last read on November 3, 2026, and from businesses that confirm their own details through Radon411's claim process.

Is every business on this page licensed in Pennsylvania?

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

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

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

Next steps

Where to go next