Tacoma, WA Radon Mitigation and Testing

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

Based on 1 user-submitted tests, the average radon level is 3.00 pCi/L.

Q: What EPA Radon Zone is Tacoma in?

Tacoma is in Pierce County, EPA Zone 3.

Q: How much does radon mitigation cost in Tacoma?

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

Avg: 3.00 pCi/L

Pierce County

EPA Zone 3

1 user test

Washington's third-largest city sits in Pierce County within the Seattle Metro area, where Puget Sound glacial deposits and volcanic ash create generally moderate radon conditions. Current testing data shows an average level of 3.0 pCi/L, which falls within EPA recommended ranges but still warrants monitoring. The diverse housing stock across Tacoma's multiple zip codes includes everything from historic homes with basements to newer construction, making professional radon testing a wise precaution for all homeowners.

3.00

pCi/L average

Below EPA Action Level

Based on 1 user-submitted radon test for homes in Tacoma, WA. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Tacoma, WA Radon Mitigation

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

Tacoma, WA Radon Testing

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

Tacoma, Washington Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
3 pCi/L	Tacoma, WA	100+ Years	Partial Basement	Mar 2020

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

Tacoma Radon Facts

Key details about the radon risk profile for Tacoma and the 98402 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Pierce County, WA

Zip Code

98402

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Avg. User Submitted Level

3.00 pCi/L

User Tests Submitted

Tacoma and the 98402 zip code are located in Pierce 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 Tacoma, WA

What is the average radon level in Tacoma, WA?

Based on 1 user-submitted test, the average radon level in Tacoma is 3.00 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 Tacoma in?

Tacoma and the 98402 zip code are in Pierce 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 Tacoma?

Radon mitigation in Tacoma 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 Tacoma?

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