St. Charles County, MO

ZIP 63341

In ZIP 63341, 4 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 Quarry/plant/pits (usdoe/army), 0.5 miles away (3 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 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 63341

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

Based on 3 census tracts · compiled October 25, 2026 · how each grade works and its sources

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