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§ 4.1 — Westmont, IL

Radon testing in Westmont, IL

This page lists 41 people and firms with a current radon testing credential whose official record names Westmont, IL. Each row shows the credential number, the issuing body, and its own verification date. The latest record check on this page was October 13, 2026; other records may have been checked earlier. Source: IL IEMA. Verify the number before you hire.

Latest credential check October 13, 2026. Methodology Individual record dates may be earlier. IL IEMA.

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. Arnold, William

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2020219

    testing

    630-325-4443October 13, 2026cite ↗

  2. Brown, Brian

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT20242405

    testing

    630-325-4443October 13, 2026cite ↗

  3. Burchert, David

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT20242389

    testing

    630-325-4443October 13, 2026cite ↗

  4. Carbonara, Diane

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2021219

    testing

    630-325-4443October 13, 2026cite ↗

  5. Carbonara, Terrence

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2020214

    testing

    630-325-4443October 13, 2026cite ↗

  6. Coghlan, Jennifer

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2005205

    testing

    630-325-4443October 13, 2026cite ↗

  7. Crout, Charles

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2017203

    testing

    630-325-4443October 13, 2026cite ↗

  8. Dunsing, James

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2004227

    testing

    630-325-4443October 13, 2026cite ↗

  9. Eccleston, Michael

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2017214

    testing

    630-325-4443October 13, 2026cite ↗

  10. Flary, Robert

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT20253227

    testing

    630-325-4443October 13, 2026cite ↗

  11. Franzen, William

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2017205

    testing

    630-325-4443October 13, 2026cite ↗

  12. Griest, Timothy

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2019205

    testing

    630-325-4443October 13, 2026cite ↗

  13. Harrison, Joseph

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT20242706

    testing

    630-325-4443October 13, 2026cite ↗

  14. Jackson, Gerald

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2022215

    testing

    630-325-4443October 13, 2026cite ↗

  15. Jacobson, Joshua

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT20232287

    testing

    630-325-4443October 13, 2026cite ↗

  16. Johnson, Adrian

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT20232280

    testing

    630-325-4443October 13, 2026cite ↗

  17. Karl, Martin

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2012213

    testing

    630-325-4443October 13, 2026cite ↗

  18. Kathan, Brian

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2016204

    testing

    630-325-4443October 13, 2026cite ↗

  19. Kolke, James

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2008215

    testing

    630-325-4443October 13, 2026cite ↗

  20. Kolke, Stacey

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2012210

    testing

    630-325-4443October 13, 2026cite ↗

  21. Lewandowski, Thomas

    Radon Detection Specialists, Inc.

    current IL IEMA № RNI2022246

    testing

    630-325-4443October 13, 2026cite ↗

  22. Macholl, Steven

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT20232194

    testing

    630-325-4443October 13, 2026cite ↗

  23. Mart, Andrea

    Radon Detection Specialists, Inc.

    current IL IEMA № RNI2022247

    testing

    630-325-4443October 13, 2026cite ↗

  24. Medina, Carlos

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT20232288

    testing

    630-325-4443October 13, 2026cite ↗

  25. Miehlke, Ed

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2002208

    testing

    630-325-4443October 13, 2026cite ↗

  26. Mikhael, Nadia

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT20263619

    testing

    630-325-4443October 13, 2026cite ↗

  27. Patel, Kamlesh

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2016217

    testing

    630-325-4443October 13, 2026cite ↗

  28. Pender, Brett

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT20232302

    testing

    630-325-4443October 13, 2026cite ↗

  29. Reilly, Stephen

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2007229

    testing

    630-325-4443October 13, 2026cite ↗

  30. Reyes, Michelle

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2013231

    testing

    630-325-4443October 13, 2026cite ↗

  31. Ruszkowski, Michael

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2013211

    testing

    630-325-4443October 13, 2026cite ↗

  32. Schmidt, Kirsten

    Radon Detection Specialists, Inc.

    current IL IEMA № RNI2006204

    testing

    630-325-4443October 13, 2026cite ↗

  33. Sidlo, Scott

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2020205

    testing

    630-325-4443October 13, 2026cite ↗

  34. Skalicky, Sharon

    Radon Detection Specialists, Inc.

    current IL IEMA № RNI2022248

    testing

    630-325-4443October 13, 2026cite ↗

  35. Smith, James

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2022211

    testing

    630-325-4443October 13, 2026cite ↗

  36. Smith, Randy

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2017204

    testing

    630-325-4443October 13, 2026cite ↗

  37. Spielman, Thomas

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2018231

    testing

    630-325-4443October 13, 2026cite ↗

  38. Stephans, Michael

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2021210

    testing

    630-325-4443October 13, 2026cite ↗

  39. Szymendera, David

    Radon Dave Llc

    current IL IEMA № RNI20242382

    testing

    312-371-1519October 13, 2026cite ↗

  40. Trujillo, Carlos

    Radon Detection Specialists, Inc.

    current IL IEMA № RNIT2013205

    testing

    630-325-4443October 13, 2026cite ↗

  41. Weber, Karen

    Radon Detection Specialists, Inc.

    current IL IEMA № RNI2014226

    testing

    630-325-4443October 13, 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 Westmont, IL?

Open the source link on this page and match the name and credential number to IL IEMA. Status can change after a record’s verification date. The latest record check on this page was October 13, 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 October 13, 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 Illinois

Illinois IEMA licenses radon measurement and mitigation professionals and technicians. The people below appear on the active licensee listing we imported. Read the methodology. Credential status can change.