St. Louis County, MO
ZIP 63121
In ZIP 63121, 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: 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 (24%), mostly chromium compounds.
- 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 nearbyC
- Air qualityF
- Drinking water qualityC
- Pesticide useA to C
- Neighborhood health statusA to F
- Past wildfire impactsA
- Past flood impactsA
- Noise levelsA to D
- Radiation signalsB to C
Based on 10 census tracts · compiled October 25, 2026 · how each grade works and its sources
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