St. Charles County, MO

ZIP 63366

In ZIP 63366, 9 of the 12 things we check have at least one part graded D or F.

• Drinking water: St Paul Pws meets every EPA legal limit; 9 contaminants are above health goals, led by lead at 44× California’s Public Health Goal.
• Nearest Superfund site: Weldon Spring Former Army Ordnance Works, 9.2 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Ameren Missouri Labadie Energy Center (40%), mostly chromium compounds.
• Fine particles (PM2.5) average 8.8 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 63366

• Superfund sites nearbyA to D
• Factories and industrial sitesB to D
• Oil and gas wellsA to B
• Parks and nature nearbyC to F
• Air qualityC to F
• Drinking water qualityD to F
• Pesticide useD to F
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsC to D

Based on 16 census tracts · compiled September 10, 2026 · how each grade works and its sources

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