Salt Lake County, UT

ZIP 84121

In ZIP 84121, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Mountain Regional Water Ssd meets every EPA legal limit; 8 contaminants are above health goals, led by arsenic at 334× California’s Public Health Goal.
• Nearest Superfund site: Murray Smelter, 1.8 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Bd Medical (55%), 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 84121

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

Based on 17 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…