College Place, WA Radon Mitigation and Testing

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

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

Q: What EPA Radon Zone is College Place in?

College Place is in Walla Walla County, EPA Zone 2.

Q: How much does radon mitigation cost in College Place?

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

Walla Walla County

EPA Zone 2

1 user test

Located in southeastern Washington's Walla Walla County, College Place has recorded an average radon level of 3.0 pCi/L from recent testing data. While this level falls within EPA recommended ranges, the Columbia River basalt geology underlying the region can create pockets of elevated radon potential. Residents in zip code 99324 should test their homes individually, as radon levels can vary significantly based on local soil conditions and home construction details.

3.00

pCi/L average

Below EPA Action Level

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

4.0 EPA

10+

College Place, WA Radon Mitigation

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

College Place, WA Radon Testing

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

College Place, Washington Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
3 pCi/L	College Place, WA	51-99 Years	No Basement/All Crawl Space	Sep 2024

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

College Place Radon Facts

Key details about the radon risk profile for College Place and the 99324 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Walla Walla County, WA

Zip Code

99324

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

3.00 pCi/L

User Tests Submitted

College Place and the 99324 zip code are located in Walla Walla County, which has an EPA assigned Radon Zone of 2. A radon zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for College Place, WA

What is the average radon level in College Place, WA?

Based on 1 user-submitted test, the average radon level in College Place 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 College Place in?

College Place and the 99324 zip code are in Walla Walla County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

How much does radon mitigation cost in College Place?

Radon mitigation in College Place 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 College Place?

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