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Certified radon testers and mitigators in Maryland

81 certified radon testers and mitigation contractors in Maryland, from the state's official list or the national NRPP directory.

11 cities & counties81 certified pros

Pros in this state come from the NRPP national certification directory (checked Oct 28, 2026). Get Radon Quotes is independent and not affiliated with NRPP. Some states also require a state license, so confirm with your state radon office before you hire. Your state radon office.

Major cities

Baltimore 9

Counties in Maryland A–Z

Smaller counties in Maryland

Counties with only a few listings so far, grouped by county.

Allegany County 2

Calvert County 1

Cecil County 2

Garrett County 1

Queen Anne's County 1

St. Mary's County 2

Get free quotes from up to 3 certified radon pros near Maryland

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Prefer to choose yourself? Every certified pro is listed above with their phone number.