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

§ 4.1 — Warrenville, IL

Certified radon testing in Warrenville, IL

7 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. Andersen, Susan

    Dupage Radon Testing Inc

    current IL IEMA № RNI2013254

    testing

    630-225-7997August 29, 2026cite ↗

  2. Greenwood, Douglas

    Dupage Radon Testing

    current IL IEMA № RNIT2014225

    testing

    630-225-7997August 29, 2026cite ↗

  3. Guardado, Jason

    Dupage Radon Testing

    current IL IEMA № RNIT20263352

    testing

    630-225-7997August 29, 2026cite ↗

  4. Murphy, Amy

    Dupage Radon Testing

    current IL IEMA № RNI2009212

    testing

    630-225-7997August 29, 2026cite ↗

  5. Murphy, Matthew

    Northeast Illinois Radon Testing

    current IL IEMA № RNI2017205

    testing

    847-566-1540August 29, 2026cite ↗

  6. Song, Daniel

    Dupage Radon Testing

    current IL IEMA № RNIT20263487

    testing

    630-225-7997August 29, 2026cite ↗

  7. Stone, David

    Dupage Radon Testing

    current IL IEMA № RNIT2001205

    testing

    630-225-7997August 29, 2026cite ↗
Fig. 4 — Warrenville, 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.