Middlesex County, NJ

ZIP 08840

In ZIP 08840, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Middlesex Water Company meets every EPA legal limit; 13 contaminants are above health goals, led by pfos at 1.8× California’s Public Health Goal.
• Nearest Superfund site: Chemical Insecticide Corp., 3.0 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Steris Isomedix Services (36%), mostly ethylene oxide.
• Fine particles (PM2.5) average 8.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 26,553 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 08840

• Superfund sites nearbyF
• Factories and industrial sitesD to F
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityD to F
• Drinking water qualityC
• Pesticide useB
• Neighborhood health statusA
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsC to D
• Radiation signalsA to B

Based on 5 census tracts · compiled October 25, 2026 · how each grade works and its sources

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