Nassau County, NY

ZIP 11709

In ZIP 11709, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Locust Valley Wd meets every EPA legal limit; 12 contaminants are above health goals, led by lead at 32× California’s Public Health Goal.
• Nearest Superfund site: Li Tungsten Corp., 3.4 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Oerlikon Metco (US) Inc (55%), mostly chromium.
• Fine particles (PM2.5) average 7.2 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 348 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 11709

• Superfund sites nearbyD to F
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyC to D
• Air qualityB
• Drinking water qualityD to F
• Pesticide useA
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to D
• Radiation signalsB

Based on 3 census tracts · compiled September 10, 2026 · how each grade works and its sources

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