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Radon testing & mitigation

Plumbing · Spokane and North Idaho

Radon testing & mitigation in Spokane Valley, WA

Spokane County is among the higher-radon areas of Washington. We test your home, and if the level is high, install a system that vents radon above the roof.

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Radon prices

Test and mitigate

Starting prices

Radon test and reportFrom $255
Radon fan, standardFrom $676
Radon fan, hard to reachFrom $944
New mitigation systemFree estimate

Get a quote

The EPA recommends fixing a home at 4.0 pCi/L or higher.

From$255Radon test with a full report

4.0pCi/LEPA action level

1DAYTypical system install

5–10YRSRadon fan life

What is included

What a mitigation system involves.

AssessmentThe foundation type, the material under the slab and where suction will work best.
Suction pointA suction point through the slab, or a sealed membrane over a crawl space.
Sealed pipingPVC pipe routed to vent above the roofline, away from windows and air intakes.
Inline fanA fan sized to the soil under the house, mounted outside the living space.
System monitorA manometer on the pipe that shows at a glance the fan is drawing.
RetestA test after installation to confirm the level came down.

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Starting prices

Radon prices.

Testing and fan replacement are priced from our book. A new system is designed for your house and priced after a free estimate.

New mitigation system: Free estimate
Retest: Every couple of years

Radon starting prices · Gold Seal flat-rate book, 2026
Service	What it covers	Starting at
Radon test With complete report	Radon test and inspection, with a complete report.	From$255 Members from $230 Get a quote →
Radon fan replacement Standard install	Replace a failed radon fan.	From$676 Members from $608 Get a quote →
Radon fan replacement Difficult install	Replace a radon fan that’s hard to reach.	From$944 Members from $850 Get a quote →

A new system’s price depends on the foundation and how the pipe reaches the roof. Member prices are for Quality Service Club members. Starting prices from our 2026 pricebook. A real person confirms your price before anything is scheduled.

Know the signs

Why test here.

You can’t see, smell or taste radon. A test is the only way to know.

Local geology

The Inland Northwest’s soil and rock produce radon, and Spokane County runs higher than most of the state.

Every house differs

Radon entry depends on each foundation, so a neighbor’s result says little about yours.

Buying or selling

A radon test is a standard part of many home sales, and a high result can be negotiated.

An existing system

If the gauge on the pipe reads level, the fan has stopped and the system isn’t working.

How it works

Test. Design. Vent.

Most residential systems are installed in one day.

01
Test
A test in the lowest lived-in level, with the house closed up.
02
Design
If the level is high, we design a system for your foundation.
03
Vent
The system goes in, usually in a day, and a retest confirms it worked.

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Questions

Radon testing & mitigation, answered.

Answers from licensed plumbers. Still unsure? Call (509) 535-5946, 24 hours a day.

Is radon a problem in Spokane?

Yes. The Inland Northwest’s geology produces radon, and Spokane County is among the higher-radon areas of Washington State. Elevated readings are common enough that testing any home here is worth it.

How much does a radon test cost?

A radon test and inspection with a complete report starts from $255 at Gold Seal. If the result is high, a mitigation system is priced after a free estimate.

At what level should I fix it?

The EPA recommends mitigation at 4.0 picocuries per liter (pCi/L) or higher, and says to consider it between 2 and 4. There is no known safe level.

How does a radon mitigation system work?

A suction point through the floor slab, sealed piping and an inline fan that runs all the time, venting soil gas above the roof. It keeps the space under the slab at slightly lower pressure than the house, so radon is drawn outside instead of in. Sealing cracks helps, but sealing alone is not mitigation.

How long does a radon fan last?

Typically five to ten years of nonstop running. Check the manometer on the pipe now and then: if the liquid levels are even, the fan has stopped. Replacing a fan starts from $676.

Membership

What members get.

Priority scheduling for emergencies, 10% off services and materials, no minor diagnostic fee, a yearly plumbing and drain safety inspection and shut-off tags on your main water valve and water heater.

Members vs non-members →

Quality Service Club

Members save

For every home and business we serve

$149first year

Plus tax. Then $95 a year when you renew.

Priority scheduling for emergencies
10% off services and materials
No minor diagnostic fee
A yearly plumbing and drain safety inspection
Shut-off tags on your main water valve and water heater

Join the Quality Service Club Everything it includes →

Related services

The same company handles every pipe on the property, from the water meter to the sewer main.

Haven’t tested? Find out what’s in the air.

Radon testing and mitigation across Spokane and North Idaho.

Call 24/7 (509) 535-5946

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