Mount Vernon, WA Radon Mitigation and Testing

Q: What EPA Radon Zone is Mount Vernon in?

Mount Vernon is in Skagit County, EPA Zone 3.

Q: How much does radon mitigation cost in Mount Vernon?

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

Skagit County

EPA Zone 3

Surrounded by Skagit County's agricultural valleys and Cascade foothills, Mount Vernon sits on alluvial soils that generally produce lower radon levels. Current testing data for zip codes 98273 and 98274 is limited, but the area's river delta geology and moderate EPA zone rating suggest radon levels typically remain manageable. Nevertheless, homeowners should consider testing, especially in newer developments built on fill dirt or properties with basement foundations.

Mount Vernon, WA Radon Mitigation

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

Mount Vernon, WA Radon Testing

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

Mount Vernon Radon Facts

Key details about the radon risk profile for Mount Vernon and the 98273 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Skagit County, WA

Zip Code

98273

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Mount Vernon and the 98273 zip code are located in Skagit 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 Mount Vernon, WA

What EPA Radon Zone is Mount Vernon in?

Mount Vernon and the 98273 zip code are in Skagit 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 Mount Vernon?

Radon mitigation in Mount Vernon 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 Mount Vernon?

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