Okanogan County, WA

ZIP 98840

In ZIP 98840, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Johnson Creek Water Users Assn has 2 contaminants at or over an EPA legal limit; 10 contaminants are above health goals, led by arsenic at 2,946× California’s Public Health Goal.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Fine particles (PM2.5) average 7.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 813,147 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 98840

• Superfund sites nearbyA
• Factories and industrial sitesA to C
• Oil and gas wellsA
• Parks and nature nearbyA to B
• Air qualityC to D
• Drinking water qualityB to F
• Pesticide useF
• Neighborhood health statusD to F
• Past wildfire impactsF
• Past flood impactsA
• Noise levelsA
• Radiation signalsB to F

Based on 4 census tracts · compiled October 25, 2026 · how each grade works and its sources

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