Bellingham, WA Radon Mitigation and Testing

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

Based on 2 user-submitted tests, the average radon level is 4.50 pCi/L.

Q: What EPA Radon Zone is Bellingham in?

Bellingham is in Whatcom County, EPA Zone 3.

Q: How much does radon mitigation cost in Bellingham?

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

Avg: 4.50 pCi/L

Whatcom County

EPA Zone 3

2 user tests

Located in Whatcom County near the Canadian border, Bellingham has recorded an average radon level of 4.5 pCi/L, slightly exceeding the EPA's 4.0 pCi/L action threshold and indicating that radon mitigation may be beneficial for local homes. The area's glacial deposits and proximity to the Cascade foothills create geological conditions that can concentrate radon gas in residential structures. Homeowners in zip codes 98225 and surrounding areas should consider professional testing and potential mitigation systems.

4.50

pCi/L average

Above EPA Action Level

Based on 2 user-submitted radon tests for homes in Bellingham, WA. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Bellingham, WA Radon Mitigation

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

Bellingham, WA Radon Testing

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

Bellingham, Washington Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
5 pCi/L	Bellingham, WA	0-20 Years	Full Basement	Jun 2022
4 pCi/L	Bellingham, WA	0-20 Years	—	Mar 2019

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

Bellingham Radon Facts

Key details about the radon risk profile for Bellingham and the 98225 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Whatcom County, WA

Zip Code

98225

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Avg. User Submitted Level

4.50 pCi/L

User Tests Submitted

Bellingham and the 98225 zip code are located in Whatcom 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 Bellingham, WA

What is the average radon level in Bellingham, WA?

Based on 2 user-submitted tests, the average radon level in Bellingham is 4.50 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 Bellingham in?

Bellingham and the 98225 zip code are in Whatcom 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 Bellingham?

Radon mitigation in Bellingham 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 Bellingham?

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