§ 4.1 — Douglas County, KS

Radon testing in Douglas County, KS

This page lists 12 people and firms with a current radon testing credential whose official record names Douglas County, KS. 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: KS KDHE. Verify the number before you hire.

Latest credential check October 13, 2026. Methodology Individual record dates may be earlier. KS KDHE.

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.

Basso, Austin
Green Factor Insulation
current KS KDHE № KS-MS-0714
testing
7852569443October 13, 2026cite ↗
Boyle, Brent
Ad Astra Home Inspections
current KS KDHE № KS-MS-0424
testing
7853935527October 13, 2026cite ↗
Bulmer, Brandon
Bulmer Environmental Solutions
current KS KDHE № KS-MS-0606 / KS-MI-0244
mitigation, testing
7859793082October 13, 2026cite ↗
Clayton, Andrew
Guidewire Consulting Llc
current KS KDHE № KS-MS-0406
testing
785-218-7817October 13, 2026cite ↗
Darnell, Hank
Hank Darnell Home Inspections
current KS KDHE № KS-MS-0411
testing
785-248-3439October 13, 2026cite ↗
Davis, James
Guidewire Consulting
current KS KDHE № KS-MS-0675
testing
7855502716October 13, 2026cite ↗
Haas, Pamela
Green Factor Insulation
current KS KDHE № KS-MS-0715
testing
7852569443October 13, 2026cite ↗
Haddadi, Daniel
Partner Engineering & Science
current KS KDHE № KS-MS-0470
testing
7855502188October 13, 2026cite ↗
Larue, Brett
Larue Inspection Service Llc
current KS KDHE № KS-MS-0444
testing
7856151337October 13, 2026cite ↗
Macke, Justin
Green Factor Insulation
current KS KDHE № KS-MS-0593 / KS-MI-0239
mitigation, testing
7852569443October 13, 2026cite ↗
Quick, Madeleine
Nova Group, Gbc
current KS KDHE № KS-MS-0658
testing
9133136567October 13, 2026cite ↗
Smith, Patrick
McKinney Home Inspection
current KS KDHE № KS-MS-0262
testing
785-760-4600October 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 Douglas County, KS?

Open the source link on this page and match the name and credential number to KS KDHE. 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

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 Kansas

Kansas KDHE certifies radon measurement and mitigation technicians. The people below appear on the certified technician PDF we imported, listed under the county of the business address on that file. Read the methodology. Credential status can change.