Somerset County, NJ

ZIP 08558

In ZIP 08558, 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, 2.6 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Custom Alloy Corp (49%), mostly chromium.
• Fine particles (PM2.5) average 6.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 19,614 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 08558

• Superfund sites nearbyD to F
• 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
• Radiation signalsC to D

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

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