Belfair, WA Radon Mitigation and Testing

Q: What EPA Radon Zone is Belfair in?

Belfair is in Mason County, EPA Zone 3.

Q: How much does radon mitigation cost in Belfair?

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

Mason County

EPA Zone 3

Located in Mason County within the Bremerton metro area, Belfair sits along Puget Sound where marine sediments and the region's mild, wet climate typically result in lower radon accumulation. With testing data for zip code 98528 currently limited, homeowners should still test given individual property variations. The area's EPA Zone 3 classification indicates generally lower radon potential consistent with western Washington's coastal geography.

Belfair, WA Radon Mitigation

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

Belfair, WA Radon Testing

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

Belfair Radon Facts

Key details about the radon risk profile for Belfair and the 98528 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Mason County, WA

Zip Code

98528

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Belfair and the 98528 zip code are located in Mason 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 Belfair, WA

What EPA Radon Zone is Belfair in?

Belfair and the 98528 zip code are in Mason 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 Belfair?

Radon mitigation in Belfair 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 Belfair?

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