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Certified radon testers and mitigators in California

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

18 cities & counties136 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

San Diego 8Los Angeles 5Oakland 5San Jose 5

Counties in California A–Z

Smaller counties in California

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

Alpine County 1

Butte County 1

Humboldt County 1

Madera County 1

Monterey County 1

Nevada County 2

San Francisco County 1

Santa Cruz County 1

Sonoma County 1

Yolo County 1

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

Tell us what you need and where. We send your request to up to 3 certified pros near you who offer that service, and they contact you directly.

What happens next

  1. We match your ZIP to certified pros nearby who offer the service you picked.
  2. Each pro gets your request and contacts you directly, usually within a business day.
  3. Compare quotes and pick one, or none. There's no fee and no obligation.

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