Ariel, WA Radon Levels
Check local Ariel radon levels and find certified testing and mitigation professionals to keep your home safe
Ariel, WA Radon Facts
EPA Radon Zone
Zone 3 — Low Risk
< 2.0 pCi/L (Zone 3)
County
Cowlitz County, WA
Zip Code
98603
Positioned in southwestern Washington's Cowlitz County along the Columbia River corridor, Ariel sits on volcanic soils and sedimentary formations that typically produce lower radon levels. Testing data for ZIP code 98603 remains sparse, though Washington's generally moderate radon potential suggests routine testing is advisable. Homes built into hillsides or with basements may warrant particular attention for radon accumulation.
Ariel, 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 Ariel, WA
What EPA Radon Zone is Ariel in?
Ariel and the 98603 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 Ariel?
Radon mitigation in Ariel 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 Ariel?
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.