Nassau County, NY

ZIP 11561

In ZIP 11561, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Liberty Utilities New York - Merrick meets every EPA legal limit; 7 contaminants are above health goals, led by trichloroethylene at 2.5× California’s Public Health Goal.
• Nearest Superfund site: Peninsula Boulevard Groundwater Plume, 8.1 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Oerlikon Metco (US) Inc (73%), mostly chromium.
• Fine particles (PM2.5) average 7.9 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 11561

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

Based on 10 census tracts · compiled October 25, 2026 · how each grade works and its sources

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