Knox County, TN

ZIP 37920

In ZIP 37920, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Knox-Chapman Utility District meets every EPA legal limit; 6 contaminants are above health goals, led by arsenic at 263× California’s Public Health Goal.
• Nearest Superfund site: Smokey Mountain Smelters, 2.3 miles away.
• Largest share of modeled toxic air from industry: Lisega Inc (44%), mostly chromium.
• Fine particles (PM2.5) average 8.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 23,013 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 37920

• Superfund sites nearbyA to F
• Factories and industrial sitesB to F
• Oil and gas wellsA to B
• Parks and nature nearbyB to D
• Air qualityB to F
• Drinking water qualityB to C
• Pesticide useA to D
• Neighborhood health statusB to F
• Past wildfire impactsA
• Past flood impactsB
• Noise levelsA to D
• Radiation signalsD to F

Based on 16 census tracts · compiled October 25, 2026 · how each grade works and its sources

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