Box Elder County, UT

ZIP 84309

In ZIP 84309, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Bear River Wcd-Harper Ward meets every EPA legal limit; 5 contaminants are above health goals, led by lead at 14× California’s Public Health Goal.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Nucor Steel - A Div Of Nucor Corp (95%), mostly chromium compounds.
• Fine particles (PM2.5) average 5.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 109,954 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 84309

• Superfund sites nearbyA
• Factories and industrial sitesC
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityA
• Drinking water qualityC to D
• Pesticide useF
• Neighborhood health statusC
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsF

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

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