Keller, WA Radon Mitigation and Testing

Q: What EPA Radon Zone is Keller in?

Keller is in Ferry County, EPA Zone 1.

Q: How much does radon mitigation cost in Keller?

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

Ferry County

EPA Zone 1

Positioned in Ferry County within Washington's northeastern mountains, Keller sits among granitic and metamorphic formations of the Okanogan Highlands. The remote community's housing consists primarily of older rural homes and cabins, many with basement or crawl space foundations that could influence radon accumulation patterns. Given the limited testing data available for the 99140 area, residents should conduct radon measurements to understand their individual exposure levels.

Keller, WA Radon Mitigation

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

Keller, WA Radon Testing

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

Keller Radon Facts

Key details about the radon risk profile for Keller and the 99140 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Ferry County, WA

Zip Code

99140

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Keller and the 99140 zip code are located in Ferry 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 Keller, WA

What EPA Radon Zone is Keller in?

Keller and the 99140 zip code are in Ferry 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 Keller?

Radon mitigation in Keller 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 Keller?

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