Nassau County, NY

ZIP 11556

In ZIP 11556, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Hempstead (V) has 3 contaminants at or over an EPA legal limit; 16 contaminants are above health goals, led by pfos at 4.7× California’s Public Health Goal.
• Nearest Superfund site: Pasley Solvents & Chemicals, Inc., 1.6 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Oerlikon Metco (US) Inc (86%), mostly chromium.
• Fine particles (PM2.5) average 8.2 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 11556

• Superfund sites nearbyF
• Factories and industrial sitesB
• Oil and gas wellsA
• Parks and nature nearbyF
• Air qualityD
• Drinking water qualityF
• Pesticide useA
• Neighborhood health statusB
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsD
• Radiation signalsB

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

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