Nassau County, NY

ZIP 11566

In ZIP 11566, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Town Of Hempstead Water Department has 1 contaminant at or over an EPA legal limit; 18 contaminants are above health goals, led by tetrachloroethylene at 95× California’s Public Health Goal.
• Nearest Superfund site: New Cassel/hicksville Ground Water Contamination, 6.7 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Oerlikon Metco (US) Inc (80%), mostly chromium.
• Fine particles (PM2.5) average 8.7 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 11566

• Superfund sites nearbyD to F
• Factories and industrial sitesB
• Oil and gas wellsA
• Parks and nature nearbyB to C
• Air qualityD to F
• Drinking water qualityB to D
• Pesticide useA
• Neighborhood health statusA to B
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to D
• Radiation signalsA

Based on 9 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…