Kalama, WA Radon Mitigation and Testing

Q: What EPA Radon Zone is Kalama in?

Kalama is in Cowlitz County, EPA Zone 3.

Q: How much does radon mitigation cost in Kalama?

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

Cowlitz County

EPA Zone 3

Located along the Columbia River in Cowlitz County, Kalama sits on volcanic deposits and river sediments that typically produce moderate radon levels in southwestern Washington. Testing data for this 98625 community is currently limited, making individual home assessment important for residents. The area's combination of volcanic geology and varying foundation types warrants professional radon testing.

Kalama, WA Radon Mitigation

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

Kalama, WA Radon Testing

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

Kalama Radon Facts

Key details about the radon risk profile for Kalama and the 98625 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Cowlitz County, WA

Zip Code

98625

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Kalama and the 98625 zip code are located in Cowlitz 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 Kalama, WA

What EPA Radon Zone is Kalama in?

Kalama and the 98625 zip code are in Cowlitz 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 Kalama?

Radon mitigation in Kalama 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 Kalama?

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