St. Louis County, MN

ZIP 55779

In ZIP 55779, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Floodwood meets every EPA legal limit; 4 contaminants are above health goals, led by arsenic at 814× California’s Public Health Goal.
• Nearest Superfund site: Arrowhead Refinery Co., 8.2 miles away.
• Largest share of modeled toxic air from industry: Sappi Cloquet LLC (88%), mostly formaldehyde.
• Fine particles (PM2.5) average 6.0 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 55779

• Superfund sites nearbyA to C
• Factories and industrial sitesA to B
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityA
• Drinking water qualityD
• Pesticide useB
• Neighborhood health statusC to F
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsC

Based on 3 census tracts · compiled September 10, 2026 · how each grade works and its sources

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