St. Louis County, MO

ZIP 63021

In ZIP 63021, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Kirkwood Pws meets every EPA legal limit; 11 contaminants are above health goals, led by lead at 813× California’s Public Health Goal.
• Nearest Superfund site: Ellisville Site, 1.6 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Control Devices (57%), mostly cobalt.
• Fine particles (PM2.5) average 9.0 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 63021

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

Based on 14 census tracts · compiled September 10, 2026 · how each grade works and its sources

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