Kent, WA Radon Mitigation and Testing

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

Based on 5 user-submitted tests, the average radon level is 3.60 pCi/L.

Q: What EPA Radon Zone is Kent in?

Kent is in King County, EPA Zone 3.

Q: How much does radon mitigation cost in Kent?

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

Avg: 3.60 pCi/L

King County

EPA Zone 3

5 user tests

Located in King County within the Seattle metropolitan area, Kent has recorded an average radon level of 3.6 pCi/L based on 5 residential tests, placing it within EPA's recommended action range though still warranting homeowner attention. The Green River valley's alluvial soils and proximity to glacial deposits create variable radon conditions across zip code 98030, with individual readings ranging from 1.0 to 8.0 pCi/L. Given this significant variation and the area's diverse housing stock, all Kent residents should test their homes to determine their specific radon exposure risk.

3.60

pCi/L average

Below EPA Action Level

Based on 5 user-submitted radon tests for homes in Kent, WA. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Kent, WA Radon Mitigation

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

Kent, WA Radon Testing

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

Kent, Washington Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
1 pCi/L	Kent, WA	—	Partial Basement	Oct 2025
4 pCi/L	Kent, WA	21-50 Years	Full Basement	Sep 2025
8 pCi/L	Kent, WA	21-50 Years	No Basement/All Crawl Space	Mar 2024
4 pCi/L	Kent, WA	51-99 Years	Full Basement	Jan 2020

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

Kent Radon Facts

Key details about the radon risk profile for Kent and the 98030 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

King County, WA

Zip Code

98030

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Avg. User Submitted Level

3.60 pCi/L

User Tests Submitted

Kent and the 98030 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 Kent, WA

What is the average radon level in Kent, WA?

Based on 5 user-submitted tests, the average radon level in Kent is 3.60 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 Kent in?

Kent and the 98030 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 Kent?

Radon mitigation in Kent 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 Kent?

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