St. Charles County, MO

ZIP 63385

In ZIP 63385, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Country Estates has 1 contaminant at or over an EPA legal limit; 3 contaminants are above health goals, led by uranium at 10× California’s Public Health Goal.
• Nearest Superfund site: Weldon Spring Former Army Ordnance Works, 3.5 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: General Motors Wentzville Assembly (53%), mostly naphthalene.
• Fine particles (PM2.5) average 8.1 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 138,436 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 63385

• Superfund sites nearbyA to F
• Factories and industrial sitesA to C
• Oil and gas wellsA to C
• Parks and nature nearbyB to D
• Air qualityB to D
• Drinking water qualityA to D
• Pesticide useC to F
• Neighborhood health statusA to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsC to D

Based on 15 census tracts · compiled October 25, 2026 · how each grade works and its sources

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