Mercer County, NJ

ZIP 08534

In ZIP 08534, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Pennington W Dept has 2 contaminants at or over an EPA legal limit; 12 contaminants are above health goals, led by arsenic at 1,098× California’s Public Health Goal.
• Nearest Superfund site: Montgomery Township Housing Development, 7.7 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Custom Alloy Corp (47%), mostly chromium.
• Fine particles (PM2.5) average 6.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 26,104 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 08534

• Superfund sites nearbyA to D
• Factories and industrial sitesB
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityB
• Drinking water qualityC to F
• Pesticide useC
• Neighborhood health statusA
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to C
• Radiation signalsD

Based on 4 census tracts · compiled October 25, 2026 · how each grade works and its sources

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