Certified radon testers and mitigators in Washington

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

4 cities & counties24 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

Spokane 8

Counties in Washington A–Z

Smaller counties in Washington

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

Kittitas County 1

Valley and Ridge

Ellensburg, WA

Certified mitigation

Get a quote (509) 245-0498 Directions

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Pierce County 1

Eci

Tacoma, WA

Certified testing

Get a quote (253) 279-2803 Directions

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Skagit County 1

PBS Engineering and Environmental

Mount Vernon, WA

Certified testing

Get a quote (206) 233-9639 Directions

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Snohomish County 1

AEI Consultants

Lynnwood, WA

Certified testing

Get a quote (425) 753-5944 Directions

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Walla Walla County 1

Cbec, LLC

Waitsburg, WA

Certified mitigationCertified testing

Get a quote (509) 520-4416 Directions

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

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What do you need?Not sure? Start with a test. Most homes only need a fix if the result is 4 pCi/L or higher.ZIP codeYour namePhoneContractors usually call to schedule.Email (optional)Anything else they should know? (optional)For example: closing date, basement type, or your result.FoundationYour radon result (if you have one)Situation

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