Sultan, WA Radon Mitigation and Testing

Q: What EPA Radon Zone is Sultan in?

Sultan is in Snohomish County, EPA Zone 3.

Q: How much does radon mitigation cost in Sultan?

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

Snohomish County

EPA Zone 3

Sultan in Snohomish County lies along the Skykomish River valley where glacial deposits and alluvial soils generally produce lower radon levels typical of western Washington. Testing data for the 98294 area remains limited, though regional geology suggests radon readings typically stay below EPA action levels. The town's mix of older logging-era homes and modern construction sits within the broader Seattle metro's moderate radon zone.

Sultan, WA Radon Mitigation

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

Sultan, WA Radon Testing

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

Sultan Radon Facts

Key details about the radon risk profile for Sultan and the 98294 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Snohomish County, WA

Zip Code

98294

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Sultan and the 98294 zip code are located in Snohomish 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 Sultan, WA

What EPA Radon Zone is Sultan in?

Sultan and the 98294 zip code are in Snohomish 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 Sultan?

Radon mitigation in Sultan 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 Sultan?

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