§ 4.1 — Baltimore, MD

Certified radon testing in Baltimore, MD

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

Last verified August 29, 2026. Methodology NRPP. NRSB.

Certified radon testingCertified radon mitigation

§ 4.3

Nearby places in Maryland

• Catonsville, MD
• Jessup, MD
• Columbia, MD
• Odenton, MD
• Arnold, MD
• Laurel, MD
• Highland, MD
• Finksburg, MD

Maryland pages here use current NRPP or NRSB certifications. City pages use the city printed on that record, not a ZIP-radius search. A national certification is not a Maryland license. Some states require a separate state credential to work legally. Read the methodology. Credential status can change.