Underwood, WA Radon Levels
Check local Underwood radon levels and find certified testing and mitigation professionals to keep your home safe
Underwood, WA Radon Facts
EPA Radon Zone
Zone 1 — High Risk
> 4.0 pCi/L (Zone 1)
County
Skamania County, WA
Zip Code
98651
Nestled in Skamania County within the Portland metro's Washington suburbs, Underwood sits on volcanic soils of the Columbia River Gorge that typically produce variable radon levels. Testing data for this small community remains limited, preventing definitive local radon assessment. Despite the area's EPA Zone 1 classification, residents of zip code 98651 should consider testing given the region's complex geological transitions.
Underwood, 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 Underwood, WA
What EPA Radon Zone is Underwood in?
Underwood and the 98651 zip code are in Skamania County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.
How much does radon mitigation cost in Underwood?
Radon mitigation in Underwood 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 Underwood?
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.
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