Washington

Radon Professionals in Washington

24 certified professionals 14 cities Moderate Radon Risk (EPA Zone 2)

Find NRPP-certified radon testing and mitigation professionals across Washington. Browse by city to see professionals in your area. Washington requires radon disclosure during real estate transactions.

Browse by City

Select your city to see certified radon professionals in your area.

Federal Way 1 Glenwood 1 Greenacres 1 Lynnwood 1 Mount Vernon 1 Renton 1 Ridgefield 1 Seattle 7 Spokane 4 Spokane Valley 1 Tacoma 1 Vancouver 2 Waitsburg 1 Walla Walla 1

Radon Services in Washington

Washington has 24 NRPP-certified radon professionals in our directory across 14 cities. 7 are certified for radon mitigation system installation. 23 hold radon testing certifications.

All professionals listed are certified through the National Radon Proficiency Program (NRPP), which is administered by AARST. NRPP certification requires passing a national exam, maintaining continuing education, and following strict quality assurance protocols.

Radon Guides for Washington

Radon Disclosure

Radon Disclosure Requirements When Selling a Home in Washington

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Radon Levels

Average Radon Levels in Washington: EPA Zone Data and What It Means

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Radon Mitigation Cost

Radon Mitigation Cost in Washington: What to Expect (2026)

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