St. Louis County, MO

ZIP 63043

In ZIP 63043, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Mo American St Louis St Charles Counties meets every EPA legal limit; 10 contaminants are above health goals, led by lithium at 3.8× the USGS health-based screening level.
• Nearest Superfund site: Westlake Landfill, 2.5 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Wood River Refinery (20%), mostly chromium compounds.
• Fine particles (PM2.5) average 9.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 18,909 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 63043

• Superfund sites nearbyD to F
• Factories and industrial sitesC to F
• Oil and gas wellsA to B
• Parks and nature nearbyC to D
• Air qualityF
• Drinking water qualityC
• Pesticide useA to C
• Neighborhood health statusA to C
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsB to C

Based on 7 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…