What radon level requires mitigation?

The EPA action level is 4.0 pCi/L. Mitigation is recommended at or above this; consider it between 2–4 pCi/L.

How much does radon mitigation cost?

Most residential systems run $800–$2,500, depending on home size, foundation type, and radon level.

Should the contractor be NRPP-certified?

Yes. NRPP or NRSB certification verifies the contractor is trained and tested to AARST standards. Every provider here is listed with their credential.

Radon Mitigation in Seattle, Washington

4 verified radon specialists serving Seattle. Every listing shows the credentials we verified.

Informational only. This page helps you find certified professionals. It is not medical, legal, or structural safety advice. For any health or safety hazard, consult a certified/licensed expert. See our verification methodology.

Typical cost in Seattle

$800–$2,500

Credentials to expect

NRPP Certified, NRSB Certified, AARST Member

Key fact

Radon causes ~21,000 lung-cancer deaths per year in the U.S. (EPA).

Radon specialists in Seattle

4 listings

We're still building out our Seattle directory. These are the 4 verified radon specialists we've confirmed so far — see more across Washington.

EHS International

Seattle, Washington

Featured

✓ NRPP Measurement✓ NRPP Mitigation

EHS International is a radon professional located in Seattle, WA. The company is certified in NRPP Measurement and NRPP Mitigation. Contact EHS International for more information.

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Aspect Consulting, a Geosyntec Company

Seattle, Washington

Pro

✓ NRPP Measurement✓ NRPP Mitigation

Aspect Consulting, a Geosyntec Company, is located in Seattle, WA and specializes in radon professional services. The company holds NRPP certifications in both measurement and mitigation. Contact Aspect Consulting, a Geosyntec Company for more information.

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EHS-International

Seattle, Washington

Pro

✓ NRPP Measurement✓ NRPP Mitigation

EHS-International is a radon professional based in Seattle, WA. The company holds NRPP Measurement and NRPP Mitigation certifications, providing professional radon testing and mitigation services. Contact EHS-International for more information.

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CBRE

Seattle, Washington

Free

✓ NRPP Measurement✓ NRPP Mitigation

CBRE is a radon professional operating in Seattle, Washington. The company holds NRPP Measurement and NRPP Mitigation certifications. Contact CBRE for more information.

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Radon Mitigation in Seattle — FAQ

What radon level requires mitigation?: The EPA action level is 4.0 pCi/L. Mitigation is recommended at or above this; consider it between 2–4 pCi/L.
How much does radon mitigation cost?: Most residential systems run $800–$2,500, depending on home size, foundation type, and radon level.
Should the contractor be NRPP-certified?: Yes. NRPP or NRSB certification verifies the contractor is trained and tested to AARST standards. Every provider here is listed with their credential.

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