Slope County, ND

ZIP 58620

In ZIP 58620, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Marmarth City Of meets every EPA legal limit; 7 contaminants are above health goals, led by bromodichloromethane at 170× 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-Belfield Gas Plant (42%), mostly benzene.
• Fine particles (PM2.5) average 5.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 79,311 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 58620

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

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

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