Suffolk County, NY

ZIP 11939

In ZIP 11939, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Suffolk County Water Authority has 2 contaminants at or over an EPA legal limit; 17 contaminants are above health goals, led by pfos at 6.2× California’s Public Health Goal.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Pcc Structurals (77%), mostly cobalt.
• Fine particles (PM2.5) average 5.7 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 11939

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

Based on 2 census tracts · compiled September 10, 2026 · how each grade works and its sources

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