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Wahkiakum County has fewer than 30 tests on record, so it doesn't meet our indexing gate. It appears as a row in theWashington county table instead.
6% of 18 radon tests here were at or above 4 pCi/L (EPA's action level). Data through 2025. Source: Radon test results by county (Washington Tracking Network).
Data through 2025 · Radon test results by county (Washington Tracking Network)
Wahkiakum County has fewer than 30 tests on record, so it doesn't meet our indexing gate. It appears as a row in theWashington county table instead.