Warren County, NJ

ZIP 07820

In ZIP 07820, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Hackettstown Mua meets every EPA legal limit; 13 contaminants are above health goals, led by lead at 68× California’s Public Health Goal.
• Nearest Superfund site: Combe Fill North Landfill, 5.7 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Cosmed Of New Jersey (31%), mostly ethylene oxide.
• Fine particles (PM2.5) average 6.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 78,994 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 07820

• Superfund sites nearbyC
• Factories and industrial sitesB
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityA
• Drinking water qualityD to F
• Pesticide useF
• Neighborhood health statusB
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA
• Radiation signalsD

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

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