St. Louis County, MN

ZIP 55812

In ZIP 55812, none of the 12 things we check has a part graded D or F.

• Drinking water: Duluth meets every EPA legal limit; 8 contaminants are above health goals, led by arsenic at 125× California’s Public Health Goal.
• Nearest Superfund site: Arrowhead Refinery Co., 8.2 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Sappi Cloquet LLC (44%), mostly formaldehyde.
• Fine particles (PM2.5) average 6.4 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 4,289 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 55812

• Superfund sites nearbyA to C
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyB to C
• Air qualityA
• Drinking water qualityC
• Pesticide useA to C
• Neighborhood health statusA to B
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to C
• Radiation signalsB to C

Based on 6 census tracts · compiled October 25, 2026 · how each grade works and its sources

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