Mountrail County, ND

ZIP 58763

In ZIP 58763, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Ross City Of meets every EPA legal limit; 5 contaminants are above health goals, led by arsenic at 280× 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: Andeavor Field Services LLC - Robinson Lake Gas Plant (76%), mostly benzene.
• Fine particles (PM2.5) average 6.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 190,353 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 58763

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

Based on 4 census tracts · compiled October 25, 2026 · how each grade works and its sources

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