Radon Testing in Seattle, WA

You’re not just testing for radon; you’re turning something invisible into a number you can act on.

Radon testing measures how much radon gas has built up inside your home. The test runs for at least 48 hours with the windows and doors kept closed. The EPA recommends taking action at 4.0 pCi/L or higher.

Radon is a colorless, odorless radioactive gas that seeps up from soil and rock. It is the second leading cause of lung cancer in the United States.

Pure View Property Inspections performs radon testing across Seattle, King County, and Snohomish County. Book it on its own, or add it to your home inspection.

What's Included in a Radon Test

Every radon test includes device placement, a full measurement period, and a written result you can act on.

Here is what you get:

  • Professional test device placement in the lowest livable level of the home
  • A minimum 48-hour measurement period under closed-house conditions, so the test measures real air, not open windows
  • Device retrieval and reading 
  • Your result in pCi/L, compared against the EPA action level
  • Plain-English interpretation: what the number means for your family
  • Next-step guidance, including referrals to radon mitigation contractors if your level is high
  • Written report you can hand to an agent or a contractor

Radon Levels in Seattle and King County

King County and Snohomish County sit in EPA Radon Zone 2. That means the predicted average indoor radon level falls between 2 and 4 pCi/L, moderate potential, not low. Washington’s highest-risk Zone 1 counties are Clark, Spokane, and Yakima. You can check the designations on the EPA Map of Radon Zones for Washington.

But a zone is an average, and averages hide outliers. Two houses on the same Seattle block can measure very differently. Soil, foundation type, and how tightly the home is sealed all change the result.

Basements and daylight basements raise the odds, and Seattle has plenty of both. Newer, tightly built homes hold air in longer, which can concentrate radon. The Washington State Department of Health recommends testing regardless of where you live.

When You Should Test for Radon

Test any time the answer would change a decision.

In practice, that means:

  • You are buying a home. Test during your inspection window, while you can still negotiate.
  • You are selling. A documented result removes a buyer objection before it starts.
  • You finished a basement. New living space below grade changes your exposure.
  • You did an energy retrofit. Tighter homes trade air more slowly.
  • Your last test was years ago. The EPA suggests retesting every two years, and after major renovations.

Why Choose Us?

We are a family-owned local inspection company, and we treat every client like part of the family.

Results You Can Trust

We don’t sell radon mitigation systems, so nothing rides on your number. You get the measurement, a plain reading of what it means, and referrals to contractors who fix it.

Answers Before You Close

A radon test needs at least 48 hours, so we place the device as early in your inspection window as we can. Your result arrives with time left to negotiate.

Fewer Trips, One Report

Add radon to your home inspection and one family-owned team handles both in fewer trips. Every inspection carries our 200% Guarantee: we refund your fee and pay for another.

Standards, Certification, and Compliance

Pure View Property Inspections is licensed and insured in Washington.

Lead inspector Elias Pedroza holds a Washington home inspector license #25008628 and is an InterNACHI Certified Professional Inspector. We carry the InterNACHI $25,000 Honor Guarantee.

Washington State does not license radon measurement professionals. Instead, the state points homeowners to nationally certified testers.

Your Radon Test Results

You get your radon results in writing, with the measured level in pCi/L and a clear reading of what it means.

 

Your result

What the EPA recommends

Below 2 pCi/L

Low. Retest every few years.

2 to 4 pCi/L

Consider mitigation.

4 pCi/L or higher

Fix the home.

 

We do not sell radon mitigation systems, so your number arrives with no upsell attached. If your level is high, we refer you to qualified contractors and help you read their quotes.



Areas We Serve Across Greater Seattle

Pure View provides home inspections across King and Snohomish County. Looking for your city? Explore our service areas:

Service Areas

You’re Not Just Ordering an Inspection

You’re investing in clarity, security, and smart decision-making. A sewer scope inspection from Pure View Property Inspections LLC empowers you to move forward with confidence, protecting your home, your budget, and your family’s peace of mind.

Frequently Asked Questions

No radon level is completely risk-free. The EPA recommends fixing homes that measure 4.0 pCi/L or higher, and considering a fix between 2 and 4 pCi/L. Outdoor air averages about 0.4 pCi/L.

It can be. King and Snohomish counties are in EPA Radon Zone 2, meaning a predicted average between 2 and 4 pCi/L. Washington’s highest-risk counties are Clark, Spokane, and Yakima. But averages don’t tell you about your house; only a test does.

A short-term test needs at least 48 hours with the doors and windows closed. Washington’s Department of Health describes a 3 to 4 day closed-house test. Plan for two to four days start to finish.

You can, and it beats not testing. But a DIY kit depends on you following the closed-house rules exactly, and mailing it to a lab adds a week. Real estate transactions usually call for a professional test, because the result has to be defensible.

Radon problems are fixable. A mitigation system vents soil gas from beneath the foundation to the outside. We refer you to qualified mitigation contractors, and we do not sell systems ourselves.

Yes, and that is the most common way clients book it. Ask for radon when you schedule your inspection, and we handle both in one trip.

Any Other Questions?

Get in touch. We’d love to help!