St. Charles County, MO

ZIP 63367

In ZIP 63367, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: St Charles County Pwsd 2 meets every EPA legal limit; 12 contaminants are above health goals, led by pfos at 1.9× 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: Ameren Missouri Labadie Energy Center (55%), mostly chromium compounds.
• Fine particles (PM2.5) average 8.6 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 63367

• Superfund sites nearbyD to F
• Factories and industrial sitesB
• Oil and gas wellsB to C
• Parks and nature nearbyB to D
• Air qualityC to D
• Drinking water qualityC
• Pesticide useC to D
• Neighborhood health statusA to C
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsC to D

Based on 9 census tracts · compiled October 25, 2026 · how each grade works and its sources

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