Hardin County, KY

ZIP 40121

In ZIP 40121, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Hardin Co. Water Dist #1/Ft. Knox meets every EPA legal limit; 13 contaminants are above health goals, led by lead at 46× California’s Public Health Goal.
• Nearest Superfund site: Distler Brickyard, 5.8 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Monument Chemical Kentucky LLC (91%), mostly ethylene oxide.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 48,357 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 40121

• Superfund sites nearbyA to D
• Factories and industrial sitesB to C
• Oil and gas wellsC to F
• Parks and nature nearbyB to D
• Air qualityC
• Drinking water qualityD to F
• Pesticide useD
• Neighborhood health statusA to F
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsD

Based on 6 census tracts · compiled September 10, 2026 · how each grade works and its sources

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