Fairfield County, CT

ZIP 06604

In ZIP 06604, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Aquarion-Eastern Fairfield County meets every EPA legal limit; 10 contaminants are above health goals, led by pfos at 2.6× California’s Public Health Goal.
• Nearest Superfund site: Raymark Industries, Inc., 4.0 miles away.
• Largest share of modeled toxic air from industry: Covidien LP (37%), mostly ethylene oxide.
• Fine particles (PM2.5) average 7.4 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 06604

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

Based on 16 census tracts · compiled October 25, 2026 · how each grade works and its sources

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