Centralia, WA Radon Mitigation and Testing

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

Based on 3 user-submitted tests, the average radon level is 7.00 pCi/L.

Q: What EPA Radon Zone is Centralia in?

Centralia is in Lewis County, EPA Zone 3.

Q: How much does radon mitigation cost in Centralia?

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

Avg: 7.00 pCi/L

Lewis County

EPA Zone 3

3 user tests

This historic lumber town in Lewis County within the Olympia Metro recorded an average radon level of 7.0 pCi/L, significantly exceeding the EPA action level. Located in EPA Zone 3, the surprisingly high readings from zip code 98531 suggest that local geological conditions may be more conducive to radon accumulation than the zone classification indicates. Homeowners should prioritize professional radon testing and mitigation if necessary.

7.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Centralia, WA Radon Mitigation

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

Centralia, WA Radon Testing

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

Centralia, Washington Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
7 pCi/L	Centralia, WA	100+ Years	Full Basement	Nov 2022

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

Centralia Radon Facts

Key details about the radon risk profile for Centralia and the 98531 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Lewis County, WA

Zip Code

98531

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Avg. User Submitted Level

7.00 pCi/L

User Tests Submitted

Centralia and the 98531 zip code are located in Lewis 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 Centralia, WA

What is the average radon level in Centralia, WA?

Based on 3 user-submitted tests, the average radon level in Centralia is 7.00 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 Centralia in?

Centralia and the 98531 zip code are in Lewis 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 Centralia?

Radon mitigation in Centralia 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 Centralia?

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