St. Charles County, MO

ZIP 63301

In ZIP 63301, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: St Peters Pws meets every EPA legal limit; 10 contaminants are above health goals, led by pfos at 1.8× California’s Public Health Goal.
• Nearest Superfund site: Westlake Landfill, 2.3 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Wood River Refinery (26%), mostly chromium compounds.
• Fine particles (PM2.5) average 9.0 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 63301

• Superfund sites nearbyC to F
• Factories and industrial sitesC to D
• Oil and gas wellsA to F
• Parks and nature nearbyB to C
• Air qualityC to F
• Drinking water qualityB to C
• 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 14 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…