Clarkston, WA Radon Levels
Check local Clarkston radon levels and find certified testing and mitigation professionals to keep your home safe
Clarkston, WA Radon Facts
EPA Radon Zone
Zone 2 — Moderate Risk
2–4 pCi/L (Zone 2)
County
Asotin County, WA
Zip Code
99403
Positioned along the Snake River in Asotin County, Clarkston sits on Columbia River basalt flows that typically produce lower radon levels than found in many regions. However, with limited testing data for zip code 99403, homeowners should still consider radon assessment, especially in properties with basement areas where gas can accumulate.
Clarkston, 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 Clarkston, WA
What EPA Radon Zone is Clarkston in?
Clarkston and the 99403 zip code are in Asotin 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 Clarkston?
Radon mitigation in Clarkston 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 Clarkston?
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.