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: South Duchesne Culinary Water has 1 contaminant at or over an EPA legal limit; 3 contaminants are above health goals, led by tthm at 78× Peer-Reviewed Research.
• 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 qualityA to D
• Pesticide useD to F
• Neighborhood health statusD to F
• Past wildfire impactsA to F
• Past flood impactsA
• Noise levelsA
• Radiation signalsC to F

Based on 2 census tracts · compiled October 25, 2026 · how each grade works and its sources

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