Olympia, WA Radon Mitigation and Testing

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

Based on 4 user-submitted tests, the average radon level is 5.00 pCi/L.

Q: What EPA Radon Zone is Olympia in?

Olympia is in Thurston County, EPA Zone 3.

Q: How much does radon mitigation cost in Olympia?

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

Avg: 5.00 pCi/L

Thurston County

EPA Zone 3

4 user tests

Olympia is located in Thurston County, Washington. With 4 user-submitted readings averaging 5.00 pCi/L, the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 98501 zip code.

5.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Olympia, WA Radon Mitigation

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

Olympia, WA Radon Testing

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

Olympia, Washington Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
5 pCi/L	Olympia, WA	0-20 Years	No Basement/All Crawl Space	Jan 2025
5 pCi/L	Olympia, WA	51-99 Years	No Basement/All Slab	Jan 2024
5 pCi/L	Olympia, WA	51-99 Years	Partial Basement	Jun 2022

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

Olympia Radon Facts

Key details about the radon risk profile for Olympia and the 98501 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Thurston County, WA

Zip Code

98501

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Avg. User Submitted Level

5.00 pCi/L

User Tests Submitted

Olympia and the 98501 zip code are located in Thurston 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 Olympia, WA

What is the average radon level in Olympia, WA?

Based on 4 user-submitted tests, the average radon level in Olympia is 5.00 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 Olympia in?

Olympia and the 98501 zip code are in Thurston 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 Olympia?

Radon mitigation in Olympia 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 Olympia?

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