Fairfield County, CT

ZIP 06840

In ZIP 06840, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Norwalk First Taxing District has 2 contaminants at or over an EPA legal limit; 12 contaminants are above health goals, led by pfos at 10× California’s Public Health Goal.
• Nearest Superfund site: Kellogg-Deering Well Field, 2.1 miles away.
• Largest share of modeled toxic air from industry: Colors & Effects USA LLC - Peekskill Facility (48%), mostly chromium compounds.
• Fine particles (PM2.5) average 7.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 7,578 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 06840

• Superfund sites nearbyD
• Factories and industrial sitesB to C
• Oil and gas wellsA
• Parks and nature nearbyC to D
• Air qualityA to C
• Drinking water qualityD to F
• Pesticide useC
• Neighborhood health statusA to B
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to D
• Radiation signalsF

Based on 6 census tracts · compiled September 10, 2026 · how each grade works and its sources

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