Mercer Island, WA Radon Levels
Check local Mercer Island radon levels and find certified testing and mitigation professionals to keep your home safe
Mercer Island, WA Radon Facts
EPA Radon Zone
Zone 3 — Low Risk
< 2.0 pCi/L (Zone 3)
County
King County, WA
Zip Code
98040
This affluent Seattle Metro community sits on an island in Lake Washington within King County, where glacial deposits and marine sediments create generally low radon conditions. Testing data for the 98040 zip code is currently unavailable, but western Washington's EPA Zone 3 classification indicates relatively low radon potential. Island properties should still consider occasional testing, especially those built on elevated sites or with unusual ventilation systems.
Mercer Island, WA Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
Need Radon Mitigation or Testing in Mercer Island?
- 100% Free, No-Obligation Quotes
- Matches You with State-Licensed King County Pros
Radon FAQ for Mercer Island, WA
What EPA Radon Zone is Mercer Island in?
Mercer Island and the 98040 zip code are in King 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 Mercer Island?
Radon mitigation in Mercer Island 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 Mercer Island?
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.