Duchesne County, UT

ZIP 84021

In ZIP 84021, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Hanna Water & Sewer Improvement District meets every EPA legal limit; 7 contaminants are above health goals, led by lead at 9.2× 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: Bluebell Gas Plant (62%), mostly formaldehyde.
• Fine particles (PM2.5) average 4.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 36,897 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 84021

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

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

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