Suffolk County, NY

ZIP 11786

In ZIP 11786, 7 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.
• Nearest Superfund site: Brookhaven National Laboratory (usdoe), 4.5 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Covidien LP (60%), mostly ethylene oxide.
• 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 11786

• Superfund sites nearbyD
• Factories and industrial sitesA to B
• Oil and gas wellsA
• Parks and nature nearbyC to D
• Air qualityA
• Drinking water qualityF
• Pesticide useC to F
• Neighborhood health statusA to D
• Past wildfire impactsA
• Past flood impactsD
• Noise levelsA to D
• Radiation signalsB

Based on 4 census tracts · compiled September 10, 2026 · how each grade works and its sources

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