St. Francois County, MO

ZIP 63640

In ZIP 63640, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Farmington Pws meets every EPA legal limit; 15 contaminants are above health goals, led by pfos at 2.4× California’s Public Health Goal.
• Nearest Superfund site: Big River Mine Tailings/st. Joe Minerals Corp., 4.0 miles away.
• Largest share of modeled toxic air from industry: Missouri Cobalt (33%), mostly cobalt.
• Fine particles (PM2.5) average 6.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 45,599 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 63640

• Superfund sites nearbyD to F
• Factories and industrial sitesA to B
• Oil and gas wellsA to B
• Parks and nature nearbyC to D
• Air qualityA to B
• Drinking water qualityC to F
• Pesticide useD to F
• Neighborhood health statusD to F
• Past wildfire impactsA
• Past flood impactsF
• Noise levelsA
• Radiation signalsC to F

Based on 11 census tracts · compiled September 10, 2026 · how each grade works and its sources

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