Port Orchard, WA Radon Mitigation and Testing

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

Based on 1 user-submitted tests, the average radon level is 5.00 pCi/L.

Q: What EPA Radon Zone is Port Orchard in?

Port Orchard is in Kitsap County, EPA Zone 3.

Q: How much does radon mitigation cost in Port Orchard?

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

Kitsap County

EPA Zone 3

1 user test

Serving as the county seat of Kitsap County in the Bremerton Metro area, Port Orchard shows an average radon level of 5.0 pCi/L that exceeds EPA action guidelines. The city's location on the Kitsap Peninsula, with its complex glacial deposits over marine sedimentary bedrock, creates conditions that can concentrate radon gas in enclosed spaces. Homeowners in both the 98366 and 98367 zip codes should prioritize radon testing and consider mitigation systems where elevated levels are confirmed.

5.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Port Orchard, WA Radon Mitigation

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

Port Orchard, WA Radon Testing

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

Port Orchard, Washington Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
5 pCi/L	Port Orchard, WA	21-50 Years	No Basement/All Slab	Oct 2025

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

Port Orchard Radon Facts

Key details about the radon risk profile for Port Orchard and the 98366 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Kitsap County, WA

Zip Code

98366

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Avg. User Submitted Level

5.00 pCi/L

User Tests Submitted

Port Orchard and the 98366 zip code are located in Kitsap 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 Port Orchard, WA

What is the average radon level in Port Orchard, WA?

Based on 1 user-submitted test, the average radon level in Port Orchard 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 Port Orchard in?

Port Orchard and the 98366 zip code are in Kitsap 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 Port Orchard?

Radon mitigation in Port Orchard 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 Port Orchard?

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