Hancock County, ME

ZIP 04421

In ZIP 04421, 1 of the 12 things we check have at least one part graded D or F.

• Drinking water: Castine Water Department meets every EPA legal limit; 6 contaminants are above health goals, led by bromodichloromethane at 51× California’s Public Health Goal.
• Nearest Superfund site: Callahan Mining Corp, 1.2 miles away.
• Largest share of modeled toxic air from industry: Fisher Engineering (67%), mostly chromium compounds.
• Fine particles (PM2.5) average 4.4 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 3,647 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 04421

• Superfund sites nearbyD
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityA
• Drinking water qualityB
• Pesticide useB
• Neighborhood health statusC
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA

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

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