Valley, WA Radon Mitigation and Testing

Q: What EPA Radon Zone is Valley in?

Valley is in Stevens County, EPA Zone 1.

Q: How much does radon mitigation cost in Valley?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Stevens County

EPA Zone 1

Nestled in Stevens County in northeastern Washington, Valley sits in a glacial valley surrounded by granite and metamorphic bedrock that can produce elevated radon concentrations. While specific testing data remains unavailable for this rural community, the geological setting suggests significant radon potential. Homeowners should prioritize testing, especially given the area's crystalline bedrock and the prevalence of basements in homes built to handle the region's cold winters.

Valley, WA Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Valley, WA Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Valley Radon Facts

Key details about the radon risk profile for Valley and the 99181 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Stevens County, WA

Zip Code

99181

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Valley and the 99181 zip code are located in Stevens County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Valley, WA

What EPA Radon Zone is Valley in?

Valley and the 99181 zip code are in Stevens County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

How much does radon mitigation cost in Valley?

Radon mitigation in Valley typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Valley?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.

Most Active Radon Markets in Washington

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Vancouver	6.56 pCi/L	9
Kent	3.60 pCi/L	5
Seattle	5.25 pCi/L	4
Olympia	5.00 pCi/L	4
Bellevue	3.75 pCi/L	4
Spokane	11.67 pCi/L	3
Camas	8.00 pCi/L	3
Centralia	7.00 pCi/L	3
Bellingham	4.50 pCi/L	2
Kirkland	4.50 pCi/L	2
Washougal	8.00 pCi/L	1
Ridgefield	5.00 pCi/L	1
Moses Lake	No submissions	0