Colfax, WA Radon Levels

Q: What EPA Radon Zone is Colfax in?

Colfax is in Whitman County, EPA Zone 2.

Q: How much does radon mitigation cost in Colfax?

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

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

Colfax, WA Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Whitman County, WA

Zip Code 99111

Situated in Whitman County within Washington's Palouse region, Colfax sits on loess deposits over basalt bedrock that characterize the rolling wheat country of southeastern Washington. While radon testing data for the 99111 zip code is limited, the geological conditions and housing patterns suggest homeowners should consider individual testing. The community's mix of historic homes and agricultural properties means radon exposure can vary significantly based on construction characteristics and foundation types.

Colfax, WA Radon Mitigation

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

Need Radon Mitigation or Testing in Colfax?

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Radon FAQ for Colfax, WA

What EPA Radon Zone is Colfax in?

Colfax and the 99111 zip code are in Whitman County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

How much does radon mitigation cost in Colfax?

Radon mitigation in Colfax 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 Colfax?

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