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College Place, WA Radon Levels

Check local College Place radon levels and find certified testing and mitigation professionals to keep your home safe


College Place, WA Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)
County Walla Walla County, WA
Zip Code 99324
Avg. User Level 3.00 pCi/L
User Tests 1

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.

0
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.

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College Place, WA Radon Levels

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

Radon LevelCityHome AgeFoundation
3 pCi/L College Place, WA 51-99 Years No Basement/All Crawl Space

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

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 in Washington with the most user-submitted radon test data, ranked by number of submissions.

CityAvg User Radon LevelSubmissions
Vancouver 6.56 pCi/L 9
Kent 3.50 pCi/L 6
Olympia 7.00 pCi/L 5
Seattle 5.25 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