Klamath County, OR

ZIP 97731

In ZIP 97731, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Diamond Lake Lodge/Resort meets every EPA legal limit; 1 contaminant is above health goals, led by lead at 31× 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.
• Largest share of modeled toxic air from industry: Gilchrist Forest Products LLC (100%), mostly lead.
• Fine particles (PM2.5) average 8.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 575,616 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 97731

• Superfund sites nearbyA
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityA to D
• Drinking water qualityD to F
• Pesticide useF
• Neighborhood health statusF
• Past wildfire impactsA to F
• Past flood impactsA
• Noise levelsA
• Radiation signalsB

Based on 2 census tracts · compiled September 10, 2026 · how each grade works and its sources

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