Northport, WA Radon Mitigation and Testing

Q: What EPA Radon Zone is Northport in?

Northport is in Stevens County, EPA Zone 1.

Q: How much does radon mitigation cost in Northport?

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

Stevens County

EPA Zone 1

Northport in Stevens County sits along the Columbia River near the Canadian border, where complex geological formations including granite intrusions can contribute to radon production in this mountainous region. Testing data for zip code 99157 remains limited, making individual radon measurements important for Spokane metro area residents. The area's diverse housing stock, from historic homes to modern construction, requires tailored testing approaches given Washington's variable geological radon potential.

Northport, WA Radon Mitigation

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

Northport, WA Radon Testing

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

Northport Radon Facts

Key details about the radon risk profile for Northport and the 99157 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Stevens County, WA

Zip Code

99157

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Northport and the 99157 zip code are located in Stevens County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Northport, WA

What EPA Radon Zone is Northport in?

Northport and the 99157 zip code are in Stevens County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

How much does radon mitigation cost in Northport?

Radon mitigation in Northport 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 Northport?

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