Top-rated radon gas testers.

Get matched with top radon gas testers in Sammamish, WA

Enter your zip and get matched with up to 3 pros

Matching on HomeAdvisor

Share some details icon
Share some details about your home project.
Match with local pros icon
Within moments, match with highly-rated local pros.
Compare quotes icon
Compare quotes and choose the best pro for the job.

Find Radon gas testers in Sammamish

Avatar for The Home Private Investigator/Home P.I., LLC
The Home Private Investigator/Home P.I., LLC
4.8(
56
)

Serving Sammamish, 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 Edgeline Restoration
Edgeline Restoration
4.9(
12
)

Serving Sammamish, WA and surrounding areas

Approved

In business since 2019

Free estimates

Emergency services offered

At Edgeline Restoration LLC, we are your local experts in water, mold and fire damage restoration as well as indoor environmental testing. We serve all of Snohomish and King county. Call us today at (206) 355-8282 for more information!

Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+23

Response time1 day
Recommended by100%of homeowners
Avatar for Cascade Radon Inc
Cascade Radon Inc
4.9(
157
)

Serving Sammamish, WA and surrounding areas

In business since 1990

Free estimates

Emergency services offered

"The whole process from testing, system design and installation went better than I ever expected. Everyone at this company was professional, competent and friendly. They answered all my questions, the installation went great and they were able to reduce my radon levels to barely detectable levels. I would recommend this company to anyone needing radon mitigation."
Recommended by99%of homeowners
Avatar for Environmental Testing & Research Laboratories, Inc
Environmental Testing & Research Laboratories, Inc
4.8(
347
)

Serving Sammamish, WA and surrounding areas

In business since 1995

Free estimates

Warranties offered

"<p>it was superb! they easiest, hassle free Radon test in town, with extremely proficient people -- very knowledgeable and very people-friendly! they took their time to explain things on the phone to me before I committed. the test came back within 10 days or so -- via email. which is very convenient. it was very clear as it is, but I like talking through it and get advice. they were instantly available to discuss. they gave me future tips to keep on top of all things Radon related. </p> <p>I have to say that all this comes to be after 3 months of many back and forths with 3 other companies -- none of the other companies could be bothered to schedule a time, and those who did, never showed up.. many times over. I don't know why I was so patient with them and I wish had discovered Environmental Testing & Research Laboratories much sooner.</p> <p>Really highly recommend them!</p> <br />"
Recommended by93%of homeowners
Avatar for AMERICAN ENVIRONMENTAL CONSTRUCTION LLC
AMERICAN ENVIRONMENTAL CONSTRUCTION LLC
4.7(
101
)

Serving Sammamish, WA and surrounding areas

In business since 2001

Free estimates

Warranties offered

"Excellent company. Iwas freaked out and they calmed me down (call them before you lose sleep!) It's not as bad as it seems. Showed up right on time. Gave an excellent consult that didn't feel rushed nor about just making money (instead.. doing it right!). The actual remediation (all the dry wall in the bathroom, cutting new electrical holes, etc was done to perfection with a clean air test and no debris. They respected HOA rules and they got all this scheduled after permits. It was a seamless stress-free process and ironically it was also the most affordable."
Recommended by93%of homeowners
Avatar for Win Home Inspection
Win Home Inspection
5.0(
16
)

Serving Sammamish, WA and surrounding areas

In business since 2005

Free estimates

Emergency services offered

"I contacted Jeff via email and scheduled via the phone. Jeff returned a call to answer detailed questions about the inspection. He showed up right on time at 10 am for our Saturday appointment. His approach was thorough and he answered my questions and made recommendations for ongoing maintenance as we moved through the unit. He also looked at common area spaces and the roof since there was access - so beyond what he had to do. The email report was in my mail within 3 hours of his leaving the condo. Jeff and Stacy were both very polite and responsive. They answered any question I had and a few I hadn't thought of. The promptness of the report enabled me to meet a contract deadline, which was very helpful."
Recommended by100%of homeowners
Showing 1-10 of 25
FAQs for radon gas testing projects in Sammamish, 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 Sammamish, WA homeowners’ guide to radon gas testings

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