Washington County, MO

ZIP 63030

In ZIP 63030, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: Potosi East meets every EPA legal limit; 4 contaminants are above health goals, led by bromodichloromethane at 9.5× California’s Public Health Goal.
• Nearest Superfund site: Washington County Lead District - Old Mines, 0.8 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Buick Resource Recycling Facility LLC (83%), mostly arsenic compounds.
• Fine particles (PM2.5) average 7.1 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 63030

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

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

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