Lopez Island, WA Radon Mitigation and Testing

Q: What EPA Radon Zone is Lopez Island in?

Lopez Island is in San Juan County, EPA Zone 3.

Q: How much does radon mitigation cost in Lopez Island?

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

San Juan County

EPA Zone 3

Lopez Island, WA resides 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. Testing is recommended for all homes in the 98261 zip code area.

Lopez Island, WA Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Lopez Island, WA Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Lopez Island Radon Facts

Key details about the radon risk profile for Lopez Island and the 98261 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

San Juan County, WA

Zip Code

98261

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Lopez Island and the 98261 zip code are located in San Juan County, which has an EPA assigned Radon Zone of 3. A radon zone of 3 predicts an average indoor radon screening level less than 2 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Lopez Island, WA

What EPA Radon Zone is Lopez Island in?

Lopez Island and the 98261 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 Lopez Island?

Radon mitigation in Lopez 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 Lopez 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 with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Vancouver	6.56 pCi/L	9
Kent	3.60 pCi/L	5
Seattle	5.25 pCi/L	4
Olympia	5.00 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
Washougal	8.00 pCi/L	1
Ridgefield	5.00 pCi/L	1
Moses Lake	No submissions	0