Knox County, TN

ZIP 37921

In ZIP 37921, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: West Knox Utility District meets every EPA legal limit; 3 contaminants are above health goals, led by total haloacetic acids (haa5) at 2.8× Peer-Reviewed Research.
• Nearest Superfund site: Smokey Mountain Smelters, 3.6 miles away.
• Largest share of modeled toxic air from industry: Rohm & Haas Chemicals LLC - Knoxville Site (51%), mostly acrylonitrile.
• Fine particles (PM2.5) average 8.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 9,097 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 37921

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

Based on 18 census tracts · compiled October 25, 2026 · how each grade works and its sources

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