Addy, WA Radon Mitigation and Testing

Q: What EPA Radon Zone is Addy in?

Addy is in Stevens County, EPA Zone 1.

Q: How much does radon mitigation cost in Addy?

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

Found in Stevens County within the Spokane Metro area, Addy sits in northeastern Washington where granitic soils and underlying crystalline bedrock can contribute to radon gas production. Testing data for zip code 99101 is limited, making individual home radon testing important for residents. Washington's EPA Zone 1 classification for this region indicates elevated radon potential across the inland Northwest's mountainous terrain.

Addy, WA Radon Mitigation

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

Addy, WA Radon Testing

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

Addy Radon Facts

Key details about the radon risk profile for Addy and the 99101 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Stevens County, WA

Zip Code

99101

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Addy and the 99101 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 Addy, WA

What EPA Radon Zone is Addy in?

Addy and the 99101 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 Addy?

Radon mitigation in Addy 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 Addy?

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