Spokane, WA Radon Mitigation and Testing

Q: What is the average radon level in Spokane, WA?

Based on 3 user-submitted tests, the average radon level is 11.70 pCi/L.

Q: What EPA Radon Zone is Spokane in?

Spokane is in Spokane County, EPA Zone 1.

Q: How much does radon mitigation cost in Spokane?

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

Avg: 11.70 pCi/L

Spokane County

EPA Zone 1

3 user tests

Spokane in Spokane County shows an average radon level of 11.67 pCi/L based on recent testing data, significantly exceeding the EPA action threshold of 4.0 pCi/L. The city's position in eastern Washington, built over granite bedrock and volcanic soils, creates conditions favorable for elevated radon accumulation in homes. With readings ranging from 3.0 to 20.0 pCi/L across different neighborhoods, professional radon testing and mitigation are strongly recommended for all residents.

11.70

pCi/L average

Above EPA Action Level

Based on 3 user-submitted radon tests for homes in Spokane, WA. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Spokane, WA Radon Mitigation

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

Spokane, WA Radon Testing

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

Spokane, Washington Radon Levels

User-submitted radon test readings from homes in the Spokane area.

Radon Level	City	Home Age	Foundation	Submitted
12 pCi/L	Spokane, WA	51-99 Years	Partial Basement	Mar 2023
20 pCi/L	Spokane, WA	100+ Years	Full Basement	Jun 2022
3 pCi/L	Spokane, WA	0-20 Years	Full Basement	May 2019

Have a radon test result for Spokane? Submit your reading to help other homeowners.

Spokane Radon Facts

Key details about the radon risk profile for Spokane and the 99201 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Spokane County, WA

Zip Code

99201

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

11.70 pCi/L

User Tests Submitted

Spokane and the 99201 zip code are located in Spokane 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 Spokane, WA

What is the average radon level in Spokane, WA?

Based on 3 user-submitted tests, the average radon level in Spokane is 11.70 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Spokane in?

Spokane and the 99201 zip code are in Spokane 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 Spokane?

Radon mitigation in Spokane 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 Spokane?

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