Napa County, CA

ZIP 94573

In ZIP 94573, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: St. Helena, City Of meets every EPA legal limit; 14 contaminants are above health goals, led by lead at 61× 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: Valero Refining Co-Cali Fornia Benicia Refinery (56%), mostly nickel compounds.
• Fine particles (PM2.5) average 7.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 906,696 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 94573

• Superfund sites nearbyA
• Factories and industrial sitesB
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityB
• Drinking water qualityD to F
• Pesticide useF
• Neighborhood health statusC
• Past wildfire impactsF
• Past flood impactsA
• Noise levelsA
• Radiation signalsC

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

Loading the full report, with every source…