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Seattle/Radon Mitigation

Radon Mitigation in Seattle, WA

Seattle homeowners face 160+ rain days per year averaging 38 inches that accelerates wear on exterior surfaces. Our local pros understand your area's specific challenges and deliver quality work on every job.

Serving Capitol Hill, Queen Anne, Bellevue, Kirkland, Redmond, and surrounding Seattle communities.

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Why Seattle Homes Need Radon Mitigation

160+ rain days per year averaging 38 inches
Persistent overcast skies promoting moss and algae
Mild temperatures rarely below 25°F or above 85°F
Occasional ice storms causing widespread damage
Wildfire smoke in late summer from eastern WA fires
Common Home Types We Service
Craftsman bungalowsMid-century ranchesNorthwest contemporary homesCedar-sided homes (common)New construction townhomes

What You Get

Reduces radon levels by 90–99%
Most systems installed in one day
Sub-slab depressurization — proven, EPA-recommended method
Quiet operation — most homeowners don't notice the system
Post-mitigation testing included to verify effectiveness
System lifespan of 20+ years with minimal maintenance

Our Radon Mitigation Process

01

Radon Testing

If you don't have recent test results, we conduct or recommend short-term (48-hour) or long-term testing before and after mitigation.

02

Diagnostic Testing

We perform suction/pressure field extension tests to determine the best system placement and pipe routing.

03

System Installation

A PVC pipe is installed through the floor slab (or membrane) and connected to a continuously running fan that draws radon from beneath the home and exhausts it above the roofline.

04

Post-Mitigation Test

A follow-up radon test confirms the system is achieving adequate reduction — typically to below 2.0 pCi/L.

Seasonal Considerations for Seattle

1
Year-round moss and algae on roofs and driveways
2
Gutter cleaning in fall from cedar and maple debris
3
Winter storm damage from windstorms
4
Spring soft washing after long rain season
5
Summer exterior painting window (July–Sept)

Areas We Serve in Seattle

Our radon mitigation pros are available throughout the Seattle metro area, including:

Capitol HillQueen AnneBellevueKirklandRedmondSammamishIssaquahMercer IslandRentonBothell

Radon Mitigation FAQ for Seattle Homeowners

How often should Seattle homeowners get radon mitigation?
Given Seattle's 160+ rain days per year averaging 38 inches, most homeowners benefit from radon mitigation at least once a year. Year-round moss and algae on roofs and driveways often makes spring or fall the optimal time to schedule service.
What home types in Seattle most need radon mitigation?
Craftsman bungalows and Mid-century ranches are the most common home types in Seattle and typically see the most wear. Our local pros are familiar with the exterior materials found across the metro.
What radon level requires mitigation?
The EPA recommends mitigation at levels of 4 pCi/L or higher. Consider mitigation at 2–4 pCi/L as there is no truly safe level of radon exposure.
How much does radon mitigation cost?
Most residential mitigation systems cost $800–$2,500 installed, depending on house construction and foundation type. This one-time cost provides lifetime protection.
How does a radon mitigation system work?
Sub-slab depressurization (SSD) is the most common method — a fan creates negative pressure beneath the slab that draws radon away from the home before it can enter, exhausting it harmlessly above the roofline.
Will a mitigation system affect my heating and cooling bills?
Sub-slab depressurization removes a small amount of air from beneath the slab, not from inside the home. The impact on energy costs is negligible.

Other Services in Seattle

Basement WaterproofingCrawl Space EncapsulationMold Remediation

Book Radon Mitigation in Seattle

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