Kelso, WA Radon Levels

Q: What EPA Radon Zone is Kelso in?

Kelso is in Cowlitz County, EPA Zone 3.

Q: How much does radon mitigation cost in Kelso?

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

Check local Kelso radon levels and find certified testing and mitigation professionals to keep your home safe

Kelso, WA Radon Facts

EPA Radon Zone Zone 3 — Low Risk < 2.0 pCi/L (Zone 3)

County Cowlitz County, WA

Zip Code 98626

Situated in Cowlitz County along Washington's southwestern coast, Kelso sits on Columbia River alluvial deposits and volcanic formations typical of the Cascade foothills region. The city's housing stock reflects Pacific Northwest architecture with many homes built on crawl space foundations rather than full basements. Although radon testing data is currently limited for the 98626 area, residents should consider testing as Washington's diverse geology can produce varying radon concentrations across different geological settings.

Kelso, WA Radon Mitigation

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

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Radon FAQ for Kelso, WA

What EPA Radon Zone is Kelso in?

Kelso and the 98626 zip code are in Cowlitz County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 pCi/L.

How much does radon mitigation cost in Kelso?

Radon mitigation in Kelso 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 Kelso?

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 in Washington with the most user-submitted radon test data, ranked by number of submissions.

City	Avg User Radon Level	Submissions
Vancouver	6.56 pCi/L	9
Kent	3.50 pCi/L	6
Olympia	7.00 pCi/L	5
Seattle	5.25 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