St. Charles County, MO

ZIP 63373

In ZIP 63373, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Portage Des Sioux Pws meets every EPA legal limit; 9 contaminants are above health goals, led by lead at 55× California’s Public Health Goal.
• Nearest Superfund site: Westlake Landfill, 8.7 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Wood River Refinery (40%), mostly chromium compounds.
• Fine particles (PM2.5) average 7.9 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 63373

• Superfund sites nearbyD
• Factories and industrial sitesD
• Oil and gas wellsF
• Parks and nature nearbyC
• Air qualityC
• Drinking water qualityD to F
• Pesticide useF
• Neighborhood health statusD
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsC

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

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