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

§ 4.1 — Marshalltown, IA

Certified radon testing in Marshalltown, IA

1 current listing from the official file. Verify the credential number before you hire.

Last verified August 29, 2026. Methodology IA HHS.

Certified radon testingCertified radon mitigation

  1. Whitehead, John I.

    Honest Home Performance And Radon Solutions

    current IA HHS № RNTST10264

    testing

    (641) 485-0432August 29, 2026cite ↗
Fig. 4 — Marshalltown, IA, 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 Iowa

Iowa HHS certifies radon measurement specialists and credentials mitigation specialists. The people below appear on the official certified/credentialed specialist PDFs we imported. Read the methodology. Credential status can change.