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Find Radon gas testers in Seattle

Avatar for The Home Private Investigator/Home P.I., LLC
The Home Private Investigator/Home P.I., LLC
4.7(
60
)
Radon Gas - Testing

Serving Seattle, WA and surrounding areas

Approved

In business since 2005

Emergency services offered

Credit card accepted

"Highly recommend hiring! Virgil was responsive, friendly, timely, very reasonable, and he sure knows his stuff! And how can you go wrong with a company name like Home PI! Would absolutely recommend working with Virgil to do testing."
OUR WORK
OUR WORK
OUR WORK
Response time3 hrs
Recommended by94%of homeowners
Avatar for 5 Microns Inc.
5 Microns Inc.
4.9(
74
)
Radon Gas - Testing

Serving Seattle, WA and surrounding areas

Approved

In business since 2019

Free estimates

Small jobs welcome

"I had an urgent situation on my hand and contacted 5 Microns because I saw the company had quite a few 5 star ratings. Pascal came out 2 1/2 hours after I spoke with him. He performed air quality testing and took samples of materials for asbestos testing. He took the time to explain the process and provided me with a good understanding of the testing process. He delivered the samples to the lab the same day and I received the results less than 24 hours later. Going forward, 5 Microns will be my first line of defense against a home remodel gone awry."
Vinyl sheeting asbestos test
Wall asbestos test
Asbestos air test
Mold and moisture testing
Mold air test

+32

Response time3 hrs
Response rate98%
Recommended by100%of homeowners
Avatar for AL-KI HOME INSPECTIONS LLC
AL-KI HOME INSPECTIONS LLC
5.0(
2
)
Radon Gas - Testing

Serving Seattle, WA and surrounding areas

In business since 2025

Free estimates

Al-KI Home Inspection is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business. Please give us a call today!

Response time3 hrs
Palm Construction and Remodeling Inc.
4.2(
88
)
Radon Gas - Testing

Serving Seattle, WA and surrounding areas

In business since 2020

Free estimates

Offers commercial services

"I am very pleased with the work that was done on my home. Palm construction took on two renovations projects at my house. Other companies weren’t willing to entertain the simultaneous projects. They were even able to start ahead of schedule. My bathroom fixtures were moved around to function better, give me more space, and the space was fully renovated. I am in love with the tile work that they did. In my kitchen they were able to change the layout, to give me the open concept I wanted. I was able to switch from electric to a gas range and the cabinetry that was installed is beautiful/high quality. The entire process was virtually stress free with the communications and updates I was given. All the timelines were met and exceeded. I would highly recommend Palm construction for any home project."
Response time2 days
Recommended by90%of homeowners
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FAQs for radon gas testing projects in Seattle, WA

Radon is the second leading cause of lung cancer in the U.S. The gas seeps through cracks in foundations and collects in basements and other low areas. Once you breathe it in, radioactive particles lodge in lung tissue and do long-term damage. Because you can’t see or smell radon, the EPA recommends testing your home every two years—and after major renovations—to keep your family safe.

Yes—every home should be tested. The EPA advises doing it at least every two years and any time you remodel, buy, or sell. On average, one in 15 houses nationwide sits above the recommended limit, and the only way to know where yours stands is a formal test. The equipment simply measures gas levels and won’t change your indoor environment, so the process is completely harmless.

Certified radon professionals—often home inspectors or dedicated radon mitigation contractors—handle testing. These radon testing professionals follow EPA protocols and use calibrated instruments to check levels throughout your house. Hiring a certified radon specialist means results you can trust for real estate deals, insurance requirements, and, most importantly, your family’s health.

Inspectors specialize in measuring radon gas levels, while licensed mitigation contractors design and install the systems that remove it. If your test comes back high, your inspector can point you to a qualified mitigation pro who will size and install the right fan, piping, or other equipment to bring levels down.

No—standard home air purifiers don’t touch radon. They’re built to trap dust and pollen, not radioactive gas. If testing shows high levels, you’ll need a dedicated mitigation system that vents the gas from beneath your home to the outdoors. Relying on a room purifier alone won’t keep your indoor air safe.

Opening a few windows in your home might dilute radon for a short time, but the gas seeps back in as soon as they’re closed. For a lasting fix, you’ll need a professional mitigation system—often a sub-slab depressurization fan—that pulls radon from beneath the foundation and safely vents it outside.

The Seattle, WA homeowners’ guide to radon gas testings

From average costs to expert advice, get all the answers you need to get your job done.