Salt Lake County, UT

ZIP 84123

In ZIP 84123, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: South Salt Lake City Water System meets every EPA legal limit; 14 contaminants are above health goals, led by lead at 12× California’s Public Health Goal.
• Nearest Superfund site: Sharon Steel Corp. (midvale Tailings), 0.7 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Kennecott Utah Copper Smelter & Refinery (47%), mostly ethylene oxide.
• Fine particles (PM2.5) average 8.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 11,147 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 84123

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

Based on 15 census tracts · compiled September 10, 2026 · how each grade works and its sources

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