Knox County, ME

ZIP 04861

In ZIP 04861, 1 of the 12 things we check have at least one part graded D or F.

• Drinking water: Maine Water Company Warren Division meets every EPA legal limit; 4 contaminants are above health goals, led by arsenic at 809× California’s Public Health Goal.
• Nearest Superfund site: Union Chemical Co., Inc., 8.7 miles away.
• Largest share of modeled toxic air from industry: Fisher Engineering (99%), mostly chromium compounds.
• Fine particles (PM2.5) average 4.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 3,235 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 04861

• Superfund sites nearbyA
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityA
• Drinking water qualityA to C
• Pesticide useC
• Neighborhood health statusD
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA
• Radiation signalsC

Based on 1 census tract · compiled October 25, 2026 · how each grade works and its sources

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