Morton County, ND

ZIP 58554

In ZIP 58554, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Missouri West Water System meets every EPA legal limit; 7 contaminants are above health goals, led by bromodichloromethane at 152× 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: Marathon Mandan Refinery (70%), mostly sulfuric acid.
• Fine particles (PM2.5) average 6.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 74,944 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 58554

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

Based on 7 census tracts · compiled October 25, 2026 · how each grade works and its sources

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