Jefferson County, KY

ZIP 40231

In ZIP 40231, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Louisville Water Company meets every EPA legal limit; 6 contaminants are above health goals, led by pfoa at 414× California’s Public Health Goal.
• Nearest Superfund site: A.l. Taylor (valley of Drums), 7.6 miles away.
• Largest share of modeled toxic air from industry: Faurecia Exhaust Systems Inc Louisville Plant (51%), mostly chromium.
• Fine particles (PM2.5) average 9.3 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 40231

• Superfund sites nearbyA
• Factories and industrial sitesD
• Oil and gas wellsB
• Parks and nature nearbyC
• Air qualityF
• Drinking water qualityC
• Pesticide useC
• Neighborhood health statusF
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsC
• Radiation signalsF

Based on 1 census tract · compiled October 25, 2026 · how each grade works and its sources

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