Box Elder County, UT

ZIP 84340

In ZIP 84340, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Willard City Water System has 1 contaminant at or over an EPA legal limit; 4 contaminants are above health goals, led by arsenic at 12,935× California’s Public Health Goal.
• Closer to Superfund sites than 57% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Petersen Inc (54%), mostly chromium.
• Fine particles (PM2.5) average 5.6 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 84340

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

Based on 2 census tracts · compiled September 10, 2026 · how each grade works and its sources

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