Nassau County, NY

ZIP 11797

In ZIP 11797, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Jericho Wd has 1 contaminant at or over an EPA legal limit; 21 contaminants are above health goals, led by arsenic at 2,476× California’s Public Health Goal.
• Nearest Superfund site: Syosset Landfill, 2.6 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Oerlikon Metco (US) Inc (87%), mostly chromium.
• Fine particles (PM2.5) average 7.6 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 11797

• Superfund sites nearbyF
• Factories and industrial sitesB
• Oil and gas wellsA
• Parks and nature nearbyD
• Air qualityB to C
• Drinking water qualityC to F
• Pesticide useA to B
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsC to D
• Radiation signalsB

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

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