Dayton, WA Radon Levels
Check local Dayton radon levels and find certified testing and mitigation professionals to keep your home safe
Dayton, WA Radon Facts
EPA Radon Zone
Zone 2 — Moderate Risk
2–4 pCi/L (Zone 2)
County
Columbia County, WA
Zip Code
99328
Located in rural Columbia County in southeastern Washington, Dayton sits within the Columbia River basalt region where volcanic bedrock generally produces moderate radon levels. Testing data remains limited for this small agricultural community, making professional radon testing important for homeowners. The area's mix of older homes with full basements and newer construction warrants individual assessment for radon exposure.
Dayton, 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 Dayton, WA
What EPA Radon Zone is Dayton in?
Dayton and the 99328 zip code are in Columbia 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 Dayton?
Radon mitigation in Dayton 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 Dayton?
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.