Bellevue, WA Radon Mitigation and Testing

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

Based on 4 user-submitted tests, the average radon level is 3.80 pCi/L.

Q: What EPA Radon Zone is Bellevue in?

Bellevue is in King County, EPA Zone 3.

Q: How much does radon mitigation cost in Bellevue?

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

Avg: 3.80 pCi/L

King County

EPA Zone 3

4 user tests

Bellevue is located in King County, Washington. With 4 user-submitted readings averaging 3.80 pCi/L, levels are currently below the EPA's recommended action level of 4.0 pCi/L. However, we recommend all homes be tested regardless of your neighbor's results.

3.80

pCi/L average

Below EPA Action Level

Based on 4 user-submitted radon tests for homes in Bellevue, WA. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Bellevue, WA Radon Mitigation

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

Bellevue, WA Radon Testing

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

Bellevue, Washington Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
2 pCi/L	Bellevue, WA	21-50 Years	Partial Basement	Feb 2025
5 pCi/L	Bellevue, WA	21-50 Years	Full Basement	Jul 2022
4 pCi/L	Bellevue, WA	51-99 Years	Partial Basement	Mar 2021

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

Bellevue Radon Facts

Key details about the radon risk profile for Bellevue and the 98004 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

King County, WA

Zip Code

98004

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Avg. User Submitted Level

3.80 pCi/L

User Tests Submitted

Bellevue and the 98004 zip code are located in King 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 Bellevue, WA

What is the average radon level in Bellevue, WA?

Based on 4 user-submitted tests, the average radon level in Bellevue is 3.80 pCi/L. This is below the EPA's recommended action level of 4.0 pCi/L. However, we recommend all homes be tested regardless of your neighbor's results.

What EPA Radon Zone is Bellevue in?

Bellevue and the 98004 zip code are in King 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 Bellevue?

Radon mitigation in Bellevue 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 Bellevue?

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