San Juan County, CO

ZIP 81433

In ZIP 81433, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Falls Creek Ranch meets every EPA legal limit; 8 contaminants are above health goals, led by arsenic at 717× California’s Public Health Goal.
• Nearest Superfund site: Bonita Peak Mining District, 7.5 miles away.
• Fine particles (PM2.5) average 3.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 378 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 81433

• Superfund sites nearbyC
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityA
• Drinking water qualityC to D
• Pesticide useF
• Neighborhood health statusC
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsB
• Radiation signalsD

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

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