New London County, CT

ZIP 06378

In ZIP 06378, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: Mashantucket Pequot Water System has 1 contaminant at or over an EPA legal limit; 6 contaminants are above health goals, led by pfoa at 829× California’s Public Health Goal.
• Nearest Superfund site: New London Submarine Base, 8.0 miles away.
• Largest share of modeled toxic air from industry: Pcc Structurals (74%), mostly cobalt.
• Fine particles (PM2.5) average 5.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 21,460 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 06378

• Superfund sites nearbyA to C
• Factories and industrial sitesC
• Oil and gas wellsA
• Parks and nature nearbyB to C
• Air qualityA
• Drinking water qualityA to D
• Pesticide useC
• Neighborhood health statusC
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to D

Based on 3 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…