Suffolk County, NY

ZIP 11940

In ZIP 11940, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: Suffolk County Water Authority meets every EPA legal limit; 2 contaminants are above health goals, led by pfos at 2.1× California’s Public Health Goal.
• Nearest Superfund site: Brookhaven National Laboratory (usdoe), 7.8 miles away.
• Largest share of modeled toxic air from industry: United Riverhead Terminal Inc (76%), mostly benzene.
• Fine particles (PM2.5) average 5.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 167,580 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 11940

• Superfund sites nearbyD
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyA to C
• Air qualityA
• Drinking water qualityC
• Pesticide useB to C
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to B
• Radiation signalsA

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

Loading the full report, with every source…