Sherwood, OR Radon Levels
Check local Sherwood radon levels and find certified testing and mitigation professionals to keep your home safe
Sherwood, OR Radon Facts
EPA Radon Zone
Zone 2 — Moderate Risk
2–4 pCi/L (Zone 2)
County
Washington County, OR
Zip Code
97140
Part of Washington County in the Portland Metro area, Sherwood falls within EPA Zone 2 for radon risk assessment. The region's volcanic soils and underlying Columbia River basalt typically produce moderate radon levels, though specific data for zip code 97140 remains limited. Professional radon testing is recommended for all homes, particularly those with below-grade living spaces or unique geological features.
Sherwood, OR 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 Sherwood, OR
What EPA Radon Zone is Sherwood in?
Sherwood and the 97140 zip code are in Washington 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 Sherwood?
Radon mitigation in Sherwood 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 Sherwood?
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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