Friday Harbor, WA Radon Levels

Q: What EPA Radon Zone is Friday Harbor in?

Friday Harbor is in San Juan County, EPA Zone 3.

Q: How much does radon mitigation cost in Friday Harbor?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Check local Friday Harbor radon levels and find certified testing and mitigation professionals to keep your home safe

Friday Harbor, WA Radon Facts

EPA Radon Zone Zone 3 — Low Risk < 2.0 pCi/L (Zone 3)

County San Juan County, WA

Zip Code 98250

The charming island town of Friday Harbor serves as the county seat of San Juan County, sitting on volcanic and marine sedimentary geology unique to the Pacific Northwest islands. Local housing includes both historic waterfront properties and modern island homes, many built on concrete foundations or pilings to accommodate the coastal environment. With radon testing data currently unavailable for zip code 98250, island residents should consider professional testing to establish their homes' radon baseline levels.

Friday Harbor, 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 Friday Harbor?

100% Free, No-Obligation Quotes
Matches You with State-Licensed San Juan County Pros

1-800-299-3578 206-973-0096 (local) Toll-free · Mon–Fri 8am–6pm ET

Radon FAQ for Friday Harbor, WA

What EPA Radon Zone is Friday Harbor in?

Friday Harbor and the 98250 zip code are in San Juan 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 Friday Harbor?

Radon mitigation in Friday Harbor 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 Friday Harbor?

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.

City	Avg User Radon Level	Submissions
Vancouver	6.56 pCi/L	9
Kent	3.50 pCi/L	6
Olympia	7.00 pCi/L	5
Seattle	5.25 pCi/L	4
Bellevue	3.75 pCi/L	4
Spokane	11.67 pCi/L	3
Camas	8.00 pCi/L	3
Centralia	7.00 pCi/L	3
Bellingham	4.50 pCi/L	2
Kirkland	4.50 pCi/L	2