St. Louis County, MO

ZIP 63121

In ZIP 63121, 7 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; 18 contaminants are above health goals, led by lead at 13× California’s Public Health Goal.
• Nearest Superfund site: St. Louis Airport/hazelwood Interim Storage/futura Coatings Co., 4.2 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Control Devices (25%), mostly chromium.
• Fine particles (PM2.5) average 9.1 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 63121

• Superfund sites nearbyD
• Factories and industrial sitesD to F
• Oil and gas wellsB to C
• Parks and nature nearbyF
• Air qualityF
• Drinking water qualityD
• Pesticide useB to C
• Neighborhood health statusB to F
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsC

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

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