St. Louis County, MO

ZIP 63146

In ZIP 63146, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Mo American St Louis St Charles Counties meets every EPA legal limit; 18 contaminants are above health goals, led by lead at 13× California’s Public Health Goal.
• Nearest Superfund site: Westlake Landfill, 5.0 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Control Devices (24%), mostly chromium compounds.
• Fine particles (PM2.5) average 9.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 18,909 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 63146

• Superfund sites nearbyC to D
• Factories and industrial sitesD
• Oil and gas wellsB
• Parks and nature nearbyC to F
• Air qualityD to F
• Drinking water qualityD
• Pesticide useB to D
• Neighborhood health statusA to C
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsC

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

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