Jefferson County, KY

ZIP 40204

In ZIP 40204, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Louisville Water Company has 3 contaminants at or over an EPA legal limit; 15 contaminants are above health goals, led by lead at 21× California’s Public Health Goal.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: O'Neal Manufacturing Services (38%), mostly chromium.
• Fine particles (PM2.5) average 9.2 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 8,583 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 40204

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

Based on 14 census tracts · compiled September 10, 2026 · how each grade works and its sources

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