Jefferson County, NY

ZIP 13643

In ZIP 13643, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Copenhagen Village meets every EPA legal limit; 6 contaminants are above health goals, led by bromodichloromethane at 114× California’s Public Health Goal.
• Nearest Superfund site: Black River Pcbs, 1.6 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: St Lawrence Zinc Co Balmat 4 Mine & Mill (73%), mostly cadmium compounds.
• Fine particles (PM2.5) average 5.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 82,549 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 13643

• Superfund sites nearbyD to F
• Factories and industrial sitesA to B
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityA
• Drinking water qualityC
• Pesticide useD
• Neighborhood health statusD
• Past wildfire impactsA
• Past flood impactsB
• Noise levelsA
• Radiation signalsC to D

Based on 2 census tracts · compiled October 25, 2026 · how each grade works and its sources

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