§ 4.1 — Naperville, IL

Radon testing in Naperville, IL

This page lists 23 people and firms with a current radon testing credential whose official record names Naperville, IL. Each row shows the credential number, the issuing body, and its own verification date. The latest record check on this page was August 29, 2026; other records may have been checked earlier. Source: IL IEMA. Verify the number before you hire.

Latest credential check August 29, 2026. Methodology Individual record dates may be earlier. IL IEMA.

Radon testing Radon 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.

Afshari, Farhad
Reliable Property Inspection Llc
current IL IEMA № RNI2005205
testing
630-464-5500August 29, 2026cite ↗
Bauman, Evan
Castle Home Inspection
current IL IEMA № RNIT2013206
testing
630-462-1050August 29, 2026cite ↗
Bleier, Mitchel
White Glove Building Inspections
current IL IEMA № RNIT20242486
testing
630-495-4555August 29, 2026cite ↗
Chen, Ying-huei
Divinity Probe Home Inspections
current IL IEMA № RNI2013227
testing
630-544-8147August 29, 2026cite ↗
Dorado, Veronica
Healthy Air Radon Testing
current IL IEMA № RNIT2018233
testing
630-601-3130August 29, 2026cite ↗
Fisher, Bruce
White Glove Building Inspections
current IL IEMA № RNI91155
testing
630-495-4555August 29, 2026cite ↗
Fisher, Carol
White Glove Building Inspections
current IL IEMA № RNIT2009212
testing
630-495-4555August 29, 2026cite ↗
Fisher, Robert
White Glove Building Inspections
current IL IEMA № RNIT2010209
testing
630-495-4555August 29, 2026cite ↗
Flynn, Roy
White Glove Building Inspections
current IL IEMA № RNIT2021213
testing
630-495-4555August 29, 2026cite ↗
Giese, Thomas
Castle Home Inspection
current IL IEMA № RNIT2021206
testing
630-462-1050August 29, 2026cite ↗
Hoddy, Paul
White Glove Building Inspections
current IL IEMA № RNIT2018203
testing
630-495-4555August 29, 2026cite ↗
Holzer, Dan
Castle Home Inspection
current IL IEMA № RNI2014205
testing
630-462-1050August 29, 2026cite ↗
Liming, Nicholas
Weaver Consultants Group
current IL IEMA № RNI20232312
testing
630-717-4848August 29, 2026cite ↗
Morar, Jared
Spot On Home Inspections Inc
current IL IEMA № RNI20242394
testing
630-542-0273August 29, 2026cite ↗
Muckler, William
Amerispec Home Inspection
current IL IEMA № RNI2005211
testing
630-554-5900August 29, 2026cite ↗
Muckler, William
Amerispec Inspection Services
current IL IEMA № RNI20253049
testing
630-554-5900August 29, 2026cite ↗
Novello, Nicholas
Castle Home Inspection
current IL IEMA № RNIT20263355
testing
630-462-1050August 29, 2026cite ↗
Rusinak, Jeffery
Castle Home Inspection
current IL IEMA № RNIT2018232
testing
630-462-1050August 29, 2026cite ↗
Schriefer, Brian
White Glove Building Inspections
current IL IEMA № RNIT20252983
testing
630-495-4555August 29, 2026cite ↗
Schroeder, Michael
White Glove Building Inspections
current IL IEMA № RNIT20263391
testing
630-495-4555August 29, 2026cite ↗
Sladek, Daniel
Perfection Home Inspection
current IL IEMA № RNI2002215
testing
630-904-2263August 29, 2026cite ↗
Teliatynskyj, Nazary
Castle Home Inspection
current IL IEMA № RNIT20252872
testing
630-462-1050August 29, 2026cite ↗
Woods, Raymone
Castle Home Inspection
current IL IEMA № RNIT20263347
testing
630-462-1050August 29, 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 Naperville, 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 August 29, 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 August 29, 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

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.
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.
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.