Washington County, MO

ZIP 63660

In ZIP 63660, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Terre Du Lac has 1 contaminant at or over an EPA legal limit; 6 contaminants are above health goals, led by lead at 15× California’s Public Health Goal.
• Nearest Superfund site: Washington County Lead District - Potosi, 4.1 miles away.
• Largest share of modeled toxic air from industry: Buick Resource Recycling Facility LLC (93%), mostly arsenic compounds.
• Fine particles (PM2.5) average 6.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 2,730 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 63660

• Superfund sites nearbyF
• Factories and industrial sitesA to B
• Oil and gas wellsA
• Parks and nature nearbyB to C
• Air qualityB
• Drinking water qualityB to D
• Pesticide useC
• Neighborhood health statusD to F
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsD to F

Based on 2 census tracts · compiled October 25, 2026 · how each grade works and its sources

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