Certified radon testers & mitigatorsIllinois — testing — verified 29 Aug 2026

§ 4.1 — Glen Ellyn, IL

Certified radon testing in Glen Ellyn, IL

2 current listings from the official file. Verify the credential number before you hire.

Last verified August 29, 2026. Methodology IL IEMA.

Certified radon testingCertified radon mitigation

  1. Peiffle, Timothy

    Us Environmental Testing / Northern Illinois Radon Llc

    current IL IEMA № RNI2015202

    testing

    630-915-9434August 29, 2026cite ↗

  2. Walsh, Timothy

    Walsh Environmental, Llc

    current IL IEMA № RNI2017208

    testing

    708-715-0008August 29, 2026cite ↗
Fig. 4 — Glen Ellyn, IL, approximate. Pin is the city on the official file, not a street address.

Appendix A — Before you hire

  1. Who holds the credential, and can they show the same number that appears on this page?
  2. What test method or mitigation system will they use for this building?
  3. How will they document results or the finished system?

§ 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.