Lyon County, NV

ZIP 89403

In ZIP 89403, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Dayton Valley Water System meets every EPA legal limit; 9 contaminants are above health goals, led by arsenic at 1,241× California’s Public Health Goal.
• Closer to Superfund sites than 96% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Tesla Gigafactory (100%), mostly cobalt compounds.
• Fine particles (PM2.5) average 7.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 105,070 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 89403

• Superfund sites nearbyD to F
• Factories and industrial sitesC to D
• Oil and gas wellsA
• Parks and nature nearbyA to C
• Air qualityB
• Drinking water qualityC to D
• Pesticide useB to F
• Neighborhood health statusC to F
• Past wildfire impactsD to F
• Past flood impactsB
• Noise levelsA
• Radiation signalsD to F

Based on 5 census tracts · compiled October 25, 2026 · how each grade works and its sources

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