Radon Testing CompaniesOregon — testing
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§ 4.1 — Portland, OR

Radon testing in Portland, OR

This page lists 12 people and firms with a current radon testing credential whose official record names Portland, OR. Each row shows the credential number, the issuing body, and its own verification date. The latest record check on this page was September 14, 2026; other records may have been checked earlier. Source: NRPP. A national certification is not a state license. Verify the number before you hire.

Latest credential check September 14, 2026. Methodology Individual record dates may be earlier. NRPP.

Radon testingRadon mitigation

Testing listings are people credentialed to measure radon. Mitigation listings are people credentialed to install a reduction system. Some people appear on both pages when the official file says they hold both.

  1. Andrew T Manla

    Four Walls Inc.

    current NRPP № 114995

    testing

    (971) 533-1165September 14, 2026cite ↗

  2. Dan Sajko

    Evren Northwest

    current NRPP № 110263

    testing

    (503) 452-5561September 14, 2026cite ↗

  3. Felicia Flanders

    Cascade Radon, Inc.

    current NRPP № 112059

    testing

    (971) 303-2003September 14, 2026cite ↗

  4. Isabel Garcia

    Evren Nw

    current NRPP № 115796

    testing

    (503) 812-4251September 14, 2026cite ↗

  5. Jennifer Levy

    Cascade Environmental Solutions

    current NRPP № 115868

    testing

    (503) 805-4846September 14, 2026cite ↗

  6. Lynn D. Green

    Evren Northwest, Inc.

    current NRPP № 107333

    testing

    (503) 452-5561September 14, 2026cite ↗

  7. Mark Harding

    Environmental Works, Inc.

    current NRPP № 107076

    testing

    (503) 719-6715September 14, 2026cite ↗

  8. Mark Norbury

    Xavier Environmental, Inc.

    current NRPP № 110576

    testing

    (503) 236-3796September 14, 2026cite ↗

  9. Michael Stipan

    Absolute Environmental

    current NRPP № 110550

    testing

    (503) 878-9828September 14, 2026cite ↗

  10. Neal Correy

    Soil Solutions Environmental Services

    current NRPP № 109634

    testing

    (503) 234-2118September 14, 2026cite ↗

  11. Reilly Quillan Flynn

    G2 Consultants

    current NRPP № 111322

    testing

    (888) 998-4224August 29, 2026cite ↗

  12. Victoria Bennett

    Evren Northwest, Inc.

    current NRPP № 111365

    testing

    (503) 452-5561September 14, 2026cite ↗
Fig. 4 — Each pin is a current listing at the Census city or county centroid on the file, approximate. Pins that share a place are spread so you can click them. Not street addresses.

Appendix A

Questions before you hire

How do I verify a radon credential listed for Portland, OR?

Open the source link on this page and match the name and credential number to NRPP. Status can change after a record’s verification date. The latest record check on this page was September 14, 2026; check each record’s date. If the official page disagrees with this directory, trust the official page. We do not invent credential numbers.

Does EPA certify radon contractors?

The U.S. EPA does not certify radon contractors. EPA publishes guidance on finding a qualified radon service provider and points to state programs and national certifications. This directory is not affiliated with EPA. We do not display EPA-certified badges.

What does last verified mean on this page?

Last verified on an individual record is the date we checked its official source. The latest credential check on this page was September 14, 2026; other records may have earlier dates. We refresh the roster monthly. Current means the person appeared as currently credentialed on the source at that record’s verification date. Credentials can expire between refreshes, so follow the source link.

Appendix A.2

Before you hire

  1. Ask who holds the credential printed on this page, and ask them to show the same number. Some firms employ several credentialed people. The listing is the person or firm on the official file, not whoever answers the phone.
  2. Ask what test method or mitigation system they will use for this building. A credential is not a work plan. Testing and mitigation are separate services here, and a person appears on both lists only when the official file says they hold both.
  3. Ask how they will document test results or the finished mitigation system. Keep that document with the credential number you verified. This directory does not score jobs, publish reviews, or collect quotes.

The full checklist: Certified radon tester: what they do and how to hire one

§ 4.3

Nearby places in Oregon

Oregon pages here use current NRPP or NRSB certifications. City pages use the city printed on that record, not a ZIP-radius search. A national certification is not a state license in Oregon. Some states require a separate state credential to work legally. Read the methodology. Credential status can change.