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

§ 4.1 — Alton, IL

Certified radon testing in Alton, IL

1 current listing 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. Peterson, Douglas

    Inspectingpro.com

    current IL IEMA № RNI20252959

    testing

    730-230-8642August 29, 2026cite ↗
Fig. 4 — Alton, 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.